sherdnerd asked:
Was just doing some back of the envelope math to explain the efficiency of trains to someone. Penn Station in New York saw about 600,000 daily passengers on weekdays in 2019. If every one of those people were to hypothetically drive a modern mini cooper instead (which, at 1.5m by 3.8m takes up an area of 6.4 square meters), it would require 3,876 square kilometres of parking. The combined area of Manhattan, Staten Island, and Long Island is 3,738 square Kilometres.
amtrak-official answered:
ALL OF LONG ISLAND???
I'm a fan of train propaganda as much as anyone but this seemed a bit much to me intuitively and indeed, the math doesn't check out. OP made a classic conversion error: it works out to 3.84 million square meters, but there are a million square meters in a square kilometer, not a thousand. Gotta remember to square your conversions too.
So in reality it's only 3.84 km². That's 10% larger than Central Park (3.41 km²) - a lot of parking to be sure - but not, in reality, all of Long Island.
Filling all of Long Island would take half a billion mini coopers, a number that is...somewhat larger than the population of New York. Trains are efficient, but not that efficient.
Okay that feels a lot more believable