[houshuang]

Same in Paris, we just vacationed there for five days, with a two year old. Very difficult to navigate in a stroller (good proxy for a wheelchair - I can lift it down the stairs, but my wife cannot alone). However, there it's quite a difficult problem to solve (I recognize) because a lot of the transfers between different stations are a bunch of underground hallways with staircases in all directions, so it's not simply enough to add elevators from the stations to platform level.

[athenot]

In Paris, the accessible stations are indicated on the maps. While that doesn't fix the accessibility issue, it can help a little bit with finding alternate stations.