At 11:56 on the morning of January 27th, 1902, a wooden shed on Park Avenue held two hundred pounds of dynamite. Thirty seconds later, every window in the Murray Hill Hotel was gone. A steam hoist had been hurled through a brick wall. Two bodies lay in the street, blown out of a trench forty feet below the sidewalk.

The contractor who stored that dynamite was Major Ira Shaler, son of a Medal of Honor general, a man the newspapers had already nicknamed the Hoodoo Contractor. Five months after the explosion, Shaler walked up to a rock face his chief engineer called rotten. He tapped it with his cane. The rock came down on top of him.

He died four days later. Shaler was one of fifteen subcontractors hired to build something that had never been attempted: twenty-one miles of railroad under the most crowded city in America in less than five years. This is the story of the machines that built the New York City Subway—and the men who ran them. It did not begin with the IRT contract in 1900.

It began thirty years earlier, with a man named Alfred Ely Beach—an editor, an inventor, and a builder of a secret subway under Broadway that he constructed without telling anyone in city government. Beach held patents on pneumatic tube systems for mail delivery. That was his cover story. In 1869 he rented the basement of Devlin’s clothing store at the corner of Broadway and Warren Street and began digging.

He told the city he was building a small pneumatic mail tube. What he was actually building was a passenger railroad. His workers excavated three hundred feet of tunnel in fifty-eight nights, working only after dark to avoid detection. The dirt was hauled out in bags and dumped into wagons on the street.

The tunnel was eight feet in diameter, lined with brick, and fitted with a single track. A forty-eight-ton blower, built by the Roots Company of Connersville, Indiana, which Beach nicknamed the Western Tornado, pushed a cylindrical rail car through the tube on a cushion of compressed air. When the car reached the far end, the blower reversed and sucked it back. The system produced no steam, no smoke, and needed no horses.

Beach opened his pneumatic subway to the public in February 1870. Twenty-five cents a ride. The waiting room had a chandelier, a fountain played near the entrance, and a grand piano sat against the wall. New Yorkers loved it.

Over four hundred thousand visitors rode the system in its first year. The technology worked, but Beach had a problem no amount of engineering could solve: William Magear Tweed. Boss Tweed controlled Tammany Hall, which controlled every transit franchise in New York. Tweed had his own plans for an elevated railroad, and he was not going to let Beach undercut him with a tunnel.

The state legislature passed Beach’s transit bill twice. Governor John Hoffman, a Tweed ally, vetoed it twice. Beach ran out of money. By 1873, the financial panic of that year killed any remaining hope of private investment.

The tunnel was sealed. The Roots blower went silent. For forty-two years, Beach’s subway sat underneath Broadway, forgotten by the city that needed it most. Beach died in January 1896 and never saw his tunnel reopen.

For the next four years, New York’s population continued to explode. By 1900, two million people were packed onto the island of Manhattan, making it the most densely populated place on Earth. The elevated railways along Second, Third, Sixth, and Ninth Avenues were running at capacity. Horse-drawn streetcars jammed the streets below.

The average commuting speed across Manhattan was less than six miles per hour. The city was suffocating on its own congestion—while the answer Beach had built thirty years earlier sat sealed behind a brick wall under Broadway. In 1912, workers excavating the new BMT Broadway line broke through that wall and found the tunnel intact. The railcar was still there on its track.

The Roots blower was still there. So was the piano. Beach’s hydraulic shield—the iron ring he used to push through the earth while workers removed soil from the front and bolted iron segments behind it—was the direct ancestor of every tunneling shield that followed. That design would cross under the East River, the Harlem River, and the Hudson.

Beach never knew it. The Rapid Transit Commission had been trying to get a subway built since 1894, but no contractor would bid. The project was too big, the engineering too uncertain, the financial risk too extreme. Finally, in January 1900, a contractor named John B.

McDonald stepped forward. Born in County Cork, Ireland, in 1844, McDonald had come to America as a child, fought in the Civil War, and built his reputation on tunnel work. He had completed the Howard Street Tunnel in Baltimore, still in active freight use today, and had built bridges in Montreal and a railroad tunnel in Hamilton, Ontario. He told the commission he could build twenty-one miles of subway from City Hall to the Bronx in four and a half years for thirty-five million dollars.

But McDonald could not post the required seven-million-dollar surety bond on his own. Enter August Belmont Jr. Belmont’s father had been the Rothschild banking agent in America, and the younger Belmont saw the subway as a generational business opportunity. He organized a financial syndicate that covered the bond, with four surety companies posting $250,000 each.

In exchange, Belmont would operate the finished subway for fifty years through his newly formed Interborough Rapid Transit Company. After fifty years, ownership would revert to the city. The contract was signed. The most important construction project in New York City history had a builder, a banker, and a deadline.

The chief engineer was William Barclay Parsons, a Columbia-educated civil engineer who had spent years studying transit systems in Europe. He toured the subways of London, Liverpool, Glasgow, and Paris before designing the New York system. In London he saw the deep tube approach, with tunnels bored far below the surface and passengers ferried down by slow hydraulic elevators. Parsons rejected that model.

Manhattan’s geology gave him an alternative: the island is a slab of hard gneiss and mica schist covered by a relatively thin layer of earth and fill. Parsons chose the cut-and-cover method. Dig a trench from the surface down to tunnel depth, thirty to fifty feet below the street. Build the tunnel structure in the open trench, cover it back up, restore the street.

The advantage was speed. The disadvantage was chaos. Every block above the trench had to keep functioning while the ground beneath it was torn apart. Gas mains, water mains, sewer lines, electrical conduits, pneumatic mail tubes, and steam pipes all had to be relocated or suspended from temporary I-beams by chain hangers before any digging could begin.

On some blocks, the utility relocation took longer than the tunnel excavation beneath it. A single mistake with a gas main could cause an explosion; a broken water main could flood the trench. Street traffic crossed the trench on timber deckings strong enough to hold loaded horse carts and streetcars. Pedestrians walked over temporary wooden sidewalks while men blasted rock forty feet below their shoes.

And all of this happened in a city that never stopped moving, twenty-four hours a day, seven days a week. McDonald subdivided the contract into fifteen sections and assigned each to a different subcontractor. Companies like McMullen, Snare, and Triest handled the deep rock cuts on Lexington Avenue. L.

B. McCabe took sections in Harlem. E. P.

Roberts and the firm of Terry and Tench handled lighter ground. Ira Shaler took section six. On March 24th, 1900, Mayor Robert Van Wyck drove a silver Tiffany spade into the ground at City Hall Park. The crowd cheered, and the newspapers ran drawings of the finished subway.

But the man who actually started building it was not the mayor. Two days later, a subcontractor named James Pilkington swung a pickaxe into a sewer line at the corner of Elm and Greene Streets. That pickaxe, not the mayor’s silver spade, was the true start of the New York City Subway. The silver spade is now in the Museum of the City of New York, accession number MNY 71907.

The pickaxe is lost to history. Here is what surprised researchers more than anything else in the project’s story. The construction of the Empire State Building required guy derricks and concrete hoists operating at a pace never matched. The cableways at Hoover Dam swung twenty-ton concrete buckets across Black Canyon every seventy-eight seconds.

One hundred and two Bucyrus steam shovels carved the Panama Canal through nine miles of volcanic rock. Every great American construction project of the early twentieth century has a signature machine at its center. The New York City Subway does not. The chief engineer’s own progress report, published in Engineering News in 1902, states it plainly: “Very little use was made of mechanical apparatus of any kind on the subway excavation.

Most of the excavated material was shoveled by hand. ”

The reason was geometry. A steam shovel in 1900 was a massive rail-mounted machine. A Bucyrus or a Marion weighed tens of tons, sat on temporary track, and needed a wide-open face to swing its dipper arm.

These machines had carved the Panama Canal through jungle and volcanic basalt. But inside a timber-decked trench under Broadway, with gas lines suspended from chains overhead and horse-drawn streetcars running on temporary decking six feet above the workers’ heads, there was no room for them. The streets were too narrow, the utilities too dense, the working space too tight. The machine that actually did the work was the Ingersoll Rand BCR pneumatic rock drill.

It weighed about fifteen pounds, was handheld, and ran on compressed air piped down from stationary compressors on the surface. Simon Ingersoll had founded his drill company on the island of Manhattan in 1871, the same year Beach sealed his tunnel one mile to the south. Ingersoll’s percussion drills had cut through the Mont Cenis tunnel in the Alps and the Gotthard tunnel in Switzerland. His company merged with the Sergeant Drill Company to form Ingersoll Sergeant, and in 1905 merged again with Rand Drill to become Ingersoll Rand.

Thirty years after Simon Ingersoll built his first drill, those same machines were cutting through bedrock directly underneath the city where they had been invented. The drilling and blasting procedure on the IRT was brutal in its simplicity. Crews worked two overlapping shifts. The drilling shift ran from roughly six in the morning to eleven at night.

The mucking shift ran from eight at night to one in the morning, overlapping with the drillers for three hours. An operator positioned the BCR against the rock face and bored a seven-foot hole into the schist, then moved and drilled another. A typical blast pattern required dozens of holes across a face that could be twenty-five to thirty-five feet high and forty to fifty feet wide on the Lexington Avenue sections. When every hole was loaded with dynamite and the pattern was set, the blast went off.

The concussion rattled windows for blocks. Residents along the route grew accustomed to the sound of underground explosions at all hours. After each blast, the mucking crews moved in. Blasted rock was shoveled by hand into three-quarter-yard and one-yard dump buckets mounted on small rail cars running on twenty-four-inch gauge track laid directly on the tunnel floor.

Mules hauled the loaded cars through the darkness to the nearest shaft. These were real mules, living and working underground for weeks at a time, stabled in improvised underground pens near the shafts. At the shaft, a stationary steam-powered hoisting engine lifted the loaded buckets to the surface using a derrick. On the deeper Lexington Avenue sections, where the rock face dropped thirty-five feet and the trench ran fifty feet below the street, larger one-and-a-half to two-yard containers called battleship skips replaced the smaller buckets.

These ran on three-foot gauge track and coasted downhill to the shaft under their own weight, then were hauled back up by cable wound on steam-powered drums. At 121st Street and Lexington Avenue, a custom-built gantry hoist handled the transfer of loaded skips from the underground track to the surface. It was not a crane in any modern sense—an improvised system of chains, cables, and steam-powered winches bolted together on site by the subcontractor to solve a problem no catalog machine could handle. The excavated rock went somewhere remarkable.

Barges carried the spoil down the East River to dump sites around the harbor. Some ended up at Governor’s Island, some at Rikers Island, but the single largest recipient was Ellis Island. In 1900 the island measured three and one-third acres. By the time the fill operations were complete, it measured twenty-seven and a half acres.

The gateway through which twelve million immigrants entered the United States was built in large part from the rock underneath the subway their descendants would ride every day. Chief Engineer Parsons’ reports are staggering by any measure. The original IRT contract excavated three and a half million cubic yards of earth and rock—enough material to fill a column one yard square stretching from New York to Los Angeles and back. Seventy-one thousand tons of structural steel came from Carnegie Steel.

Ten thousand tons of cast iron went into columns and supports. Five hundred thousand cubic yards of concrete required one and a half million barrels of cement from the United Building Materials Company. Nearly one million square yards of waterproofing membrane sealed the tunnel against groundwater. And through all of this, one and a half to two tons of dynamite were consumed every single day.

Chief Engineer Parsons confirmed that figure himself in 1903. Over four and a half years of active construction, the total runs into the low thousands of tons of high explosives detonated underneath a city of two million people. The wonder is not that accidents happened. The wonder is that more did not.

But accidents did happen, and the worst of them brought the story back to the man who opened it. Major Ira Alexander Shaler held section six, running from 34th Street to 42nd Street directly under Park Avenue. This was the deepest rock cut on the entire IRT route. Shaler’s father was Brigadier General Alexander Shaler, who had earned the Medal of Honor at the Battle of Marye’s Heights during the Civil War.

The younger Shaler was an experienced contractor with a growing reputation for bad luck, and his section had already suffered minor incidents long before the explosion. On the morning of January 27th, 1902, Shaler’s crews had stored reserve dynamite in a wooden shed at the surface of the Park Avenue shaft. Storing dynamite near the working face was standard practice. At 11:56 in the morning, two smaller detonations preceded the main blast.

Then two hundred pounds of stored dynamite ignited at once. The explosion killed five people at the shed and in the immediate vicinity. A steam engine used for hoisting rock from the trench was picked up bodily and thrown through a brick wall into the tunnel of the Park Avenue streetcar line. Debris showered down on the Murray Hill Hotel and the Grand Union Hotel.

Every window facing the blast was shattered across a full city block. Two workers were blown out of the trench and onto the street above. Over 125 people were injured. In 1905, a court found the city government jointly liable, ruling that the Rapid Transit Commission had failed to establish adequate safety protocols for explosive storage on subway construction sites.

Five months later, on June 17th, 1902, Shaler was inspecting his section with Chief Engineer Parsons. They reached a rock outcrop at the tunnel face. Parsons examined it and called it rotten—geologically unstable. Shaler disagreed.

He stepped out from under a protective timber cover and tapped the rock face with his cane. The entire outcrop collapsed on top of him. He was pulled from the rubble alive but badly crushed. He died on June 29th, 1902.

He was forty years old. The man the newspapers called the Hoodoo Contractor was killed by the rock he refused to respect. The total confirmed death toll on the original IRT contract is at least sixteen killed and 125 injured, but that figure covers only the three largest named incidents. The actual number of workers killed across all fifteen sections over four and a half years is almost certainly higher.

Records from that era are incomplete, and many of the laborers were recent immigrants whose deaths went unrecorded in official city documents. The men who survived carried granite dust in their lungs for the rest of their lives. Silicosis, the scarring disease caused by inhaling fine rock particles, was not even formally named until decades after the subway was finished. But the men who drilled the holes and mucked the rock knew what was happening to them.

They coughed. They lost weight. They kept drilling. Cut-and-cover only worked on land.

The moment the route needed to cross from Manhattan to Brooklyn or Queens, an entirely different technology was required: the tunneling shield. The concept went back to Marc Brunel, who patented a rectangular tunneling shield in 1818 for the Thames Tunnel in London. His son, Isambard Kingdom Brunel, completed that tunnel in 1843 after eighteen years of construction and multiple floods that killed workers. In 1869, South African–born engineer James Henry Greathead improved the design dramatically by making the shield circular instead of rectangular, using it to build the Tower Subway beneath the Thames in just ten months.

That circular geometry became the worldwide standard for soft-ground tunneling. Beach had used a similar circular shield for his 1870 pneumatic subway under Broadway. The Steinway Tunnel, connecting Manhattan to Queens at 42nd Street, was one of the first major applications. Ground was broken on June 3rd, 1892, under contractor Pomeroy P.

Dickinson, with William Barclay Parsons serving as consulting engineer. The twin tubes were fifteen feet six inches in internal diameter, 8,500 feet long, and reached eighty-eight feet below mean high water. The shield itself was a massive iron cylinder with a sharpened cutting edge at the front and a battery of hydraulic rams at the rear. The rams pushed the shield forward into the saturated silt and clay of the riverbed a few inches at a time.

Workers inside the pressurized chamber at the front excavated soil by hand from the face while engineers maintained compressed air pressure at roughly forty pounds per square inch to hold back the river water. Behind the shield, crews bolted cast iron ring segments into place to form the permanent tunnel lining. Each ring was assembled from curved sections caulked with lead and grouted to seal against leaks. The Joralemon Street Tunnel, connecting Manhattan to Brooklyn, used the same method.

Its twin tubes reached ninety-one to ninety-five feet below mean high water. It was the first underwater subway tunnel between the two boroughs and, at the time of its completion, one of the deepest subaqueous tunnels in the world. But compressed-air tunneling was lethal in ways that went beyond the risk of the river breaking through. At forty pounds per square inch, nitrogen dissolved into the blood of every man working in the heading.

When they returned to normal atmospheric pressure at the end of their shift, that nitrogen came out of solution as gas bubbles in the joints, the spine, and the brain. The workers called it the bends; the formal medical term was caisson disease. The Brooklyn Bridge caissons had introduced the condition to American construction decades earlier, when Washington Roebling himself was permanently crippled by it. But subway tunneling made caisson disease routine.

Roughly fifty sandhogs died of the bends during the Pennsylvania Railroad’s North River Tunnels between 1904 and 1908, with death certificates initially falsified to conceal the true cause. Then there were the blowouts. When the compressed air inside the shield found a weak point in the riverbed above, it punched through the silt and erupted from the surface in a geyser of mud and water. Everything inside the heading—tools, timber, men—was sucked toward the breach.

In February 1916, a leak in the compressed air seal of the shield on the Montague Street Tunnel sucked three sandhogs through an eighteen-inch hole in the tunnel face, through twelve feet of river mud, and out the surface of the East River on top of a twenty-five-foot geyser. Marshall Mabey survived the ejection and was pulled from the water by a passing tugboat. Frank Driver and Michael McCarthy were not as fortunate. Both died.

An earlier Hudson Tunnel blowout on July 21st, 1880, had killed twenty of the twenty-eight men trapped in the heading. Sandhog mortality on the early Hudson tubes was reckoned at roughly one man per foot of tunnel advanced. The compressed-air workers, by now formally called sandhogs across every job site in the city, organized themselves into the Compressed Air Workers Union in 1892. Local 147 in New York remains active today, still sending men underground to extend and repair the same tunnel network their predecessors began building more than a century ago.

The evolution of subway construction equipment spans three distinct eras. The IRT was built between 1900 and 1904 almost entirely with hand tools, Ingersoll Rand pneumatic drills, dynamite, mules, derricks, and the improvised engineering of fifteen subcontractors working under a thirty-five-million-dollar deadline. Opening day was October 27th, 1904. One hundred and fifty thousand New Yorkers rode the subway in its first five hours of operation.

The fare was five cents. The dual contracts era began in 1913, when the city signed agreements with both the IRT and the Brooklyn Rapid Transit Company to expand the system by 618 miles of new track. For the first time, steam shovels appeared in meaningful numbers on subway construction, but they only worked on the open-cut sections in Brooklyn and the Bronx, where the streets were wider and the underground utility networks less dense. The 4th Avenue line in Brooklyn, the Sea Beach line, and the West End line all used Bucyrus and Marion rail-mounted steam shovels to excavate the wider, shallower trenches through less congested outer-borough terrain.

Manhattan remained hand-tool territory throughout the dual contracts era. The IND era, beginning in the late 1920s, brought the first real mechanization to Manhattan subway work. The Independent Subway System was the first system designed, built, and operated entirely by the city government, without private companies running the finished lines. The 6th Avenue line, which broke ground when Mayor Fiorello LaGuardia drove a ceremonial pickaxe into the pavement at Bryant Park on March 23rd, 1936, was arguably the most difficult tunnel job in New York City subway history.

The route had to thread between the active PATH tubes of the Hudson and Manhattan Railroad running directly under 6th Avenue, the Catskill Aqueduct carrying five hundred million gallons of water per day roughly two hundred feet below the surface, and the still-operating IRT 6th Avenue elevated railroad directly above. Blasting was restricted to tiny charges, mostly detonated at night to avoid disturbing PATH service. Three named contractors carved up the Midtown section. Rosoff Brothers Construction took 40th to 47th Street and 33rd to 40th Street.

The Carlton Company handled 27th to 33rd Street. The George A. Flynn Corporation built 47th to 53rd Street under a contract valued at $4,616,476. A central compressor plant and shaft were built at 46th Street.

The line cost fifty-nine and a half million dollars for two and a half miles and was completed on December 15th, 1940. There is a famous story about this section that deserves honest treatment. The story holds that a Caterpillar bulldozer was lowered in pieces through a twelve-foot shaft beneath 6th Avenue in 1936, reassembled underground by sandhogs working under Edison bulbs, and remained sealed beneath the street for eleven years. Researchers spent weeks trying to verify it, searching the Caterpillar corporate archives in Peoria, Illinois, the Historical Construction Equipment Association records, the complete histories for the IND 6th Avenue line, and every accessible New York Times archive reference.

They found no contemporary newspaper account, no engineering progress report, no Caterpillar service record, and no official transit authority document confirming the story. There is also a technical problem. Caterpillar did not manufacture its own bulldozer blade until 1945, according to the company’s official corporate timeline. Any Caterpillar tractor working underground in 1936 would not have been a Caterpillar bulldozer; it would have been a Caterpillar crawler tractor fitted with a cable-operated blade manufactured by a third party, likely LeTourneau, LaPlant-Choate, or Bucyrus-Erie.

The distinction matters because it changes the identity of the machine at the center of the legend. That does not mean the story is entirely false. Crawler tractors almost certainly did work underground during IND construction. The 46th Street shaft and compressor plant are documented, and the scale of the excavation required mechanical assistance.

But the specific details of the legend—the eleven years underground, the machine sealed in and forgotten—have no primary source behind them. What can be verified is extraordinary enough without embellishment. Three and a half million cubic yards of Manhattan rock and earth excavated in four and a half years. Seventy-one thousand tons of structural steel from Carnegie.

Five hundred thousand cubic yards of concrete. One and a half million barrels of cement. A workforce that peaked at 7,700 men, earning two dollars a day, breathing granite dust that scarred their lungs permanently—if the dynamite and the falling rock and the compressed air did not kill them first. At least sixteen confirmed dead and 125 injured on the original IRT contract alone, with the true total across forty years and three construction eras almost certainly many times higher.

The rock they pulled from underneath Manhattan built Ellis Island. The holes they drilled still carry trains. Today, five million people ride the New York City Subway every day, most of them passing through tunnels framed by steel and concrete poured between 1900 and 1940. The tunnel linings in the oldest IRT sections—the ones hand-drilled, hand-mucked, and hand-concreted by men earning two dollars a day in 1902—are in better structural condition today than many of the extensions built after 1970.

A retired subway worker with thirty-eight years underground confirmed exactly that, saying the original tunnels are still in far better shape than the modern ones. The men who built them are gone. The rock they drilled through is still holding.

And five million people trust it with their lives every single day.