I had to take a picture of these steps in Chicago’s Union Station recently.
If you’ve seen The Untouchables, you’ll know why. The ‘pram scene’ is a brilliant piece of cinema; you can see it here, though this clip is missing the long build-up which is part of what makes the original so effective.
Of course, it is itself an homage to the scene in Battleship Potemkin at the Odessa steps, but I didn’t know until today that it too had inspired a later cinematic tribute.