Tokyo was burned to the ground though just before that started. [https://en.m.wikipedia.org/wiki/Bombing_of_Tokyo]

It also wasn’t really a major city historically over the types of timeframes as London, Paris, or even New York.

Modern Tokyo is more of a ‘new’ city, and the subways were constructed along with a lot of the new construction - that central Tokyo was almost completely destroyed in the war certainly removed the friction that would otherwise have made that hard, eh?