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We tend to picture private railroads as something you would find on a sprawling country estate, a rich man's toy winding through the grounds. But Senator William A. Clark built one beneath Manhattan, inside the footprint of his Fifth Avenue mansion, for a gloriously mundane purpose: hauling in coal.
Heating a 121-room, nine-story house in 1911 was no small undertaking. These were the days before clean central utilities, when warmth meant burning enormous quantities of coal in basement furnaces, and delivering that coal to a building the size of Clark's was a logistical problem. Clark, who had made his fortune in mining and never did anything by halves, solved it with a private underground rail line that brought the coal directly into the building, out of sight of the street and his fashionable neighbors.
To understand why a man would build a secret coal railway under his own house, you have to understand Clark. He was a copper baron from Montana, one of the richest men in America, and a United States Senator with a reputation for getting exactly what he wanted, by fair means or foul. When he built his New York palace, he refused to depend on anyone. He bought his own granite quarry in New Hampshire and laid a railroad to move the stone. He bought a bronze foundry employing two hundred men to make the fittings.
Against that backdrop, a private underground railway for coal was practically restrained. It was simply how Clark did things: identify a problem, then throw unlimited money and engineering at it until it disappeared. The coal line was invisible to guests, who saw only the warm, glittering rooms above, never suspecting the small industrial operation humming beneath their feet.
And what rooms they were. The coal that traveled that secret railway heated a marble rotunda thirty-six feet high, a picture gallery ninety-five feet long, a Gothic library stretching ninety feet, and an organ loft holding the largest chamber organ in America. It warmed Turkish baths below ground and twenty-five guest rooms, each with its own bath. The mansion also hid a concealed garage and a swimming pool. It was, in every sense, a machine for impressing people.
The critics, famously, were not impressed. They mocked the house as 'Clark's Folly' and called it the House of a Thousand Cartouches. But whatever they thought of its style, the mansion was an extraordinary feat of engineering, packed with systems and conveniences that were decades ahead of most of the city. The coal railway was just the most theatrical example of a house built to solve every problem money could solve.
The irony, of course, is that all of this ingenuity bought the house almost no time at all. Clark died in 1925. By 1927 the mansion had been sold and demolished, barely sixteen years after it was completed. The coal railway, the rotunda, the great organ, the Turkish baths, all of it was ripped out and carted away to make room for an apartment building.
There is something almost absurd about the effort-to-lifespan ratio. Clark spent fourteen years and a fortune building a house with its own quarry-supplied stone, its own foundry-made bronze, and its own underground coal railroad, and the whole thing lasted less than two decades. The private railway, surely one of the strangest domestic features in the city's history, served its purpose for only a handful of winters before being destroyed.
Today, when people remember the Clark mansion at all, it is usually for the numbers: the 121 rooms, the 31 bathrooms. But the detail that best captures the sheer, almost deranged ambition of the place is the coal railroad, a private train line built beneath one of the busiest avenues on earth, for no grander purpose than keeping one family warm.
It is the perfect symbol of Gilded Age excess, and of its fragility. A man could build a railroad inside his own basement, and within a generation both the railroad and the mansion above it would be gone, remembered only in old photographs and a handful of disbelieving paragraphs like this one.
