An exception to the cut-and-cover construction had to be used at Washington Heights which include the highest natural point in Manhattan at 81 metres (265 feet) above sea level. So the platforms here at 181st Street station on the tunnelling construction was used. The line is reached by "three massive elevators" and and we have a wide space free of pillars.

Clearly the subway builders were not familiar with deep tube building techniques. There was a fatal accident during construction in 1903 and in 2009 an eight metre long section of the brick lining collapsed.

And even here, if we look in the opposite direction along the platform, they have reverted to their beloved pillars.

But by the time we get to Dyckman Street the subway has become overground.