The city buses here have side-facing seats in the front that are easier for the disabled, elderly, and those pushing strollers. People are good about vacating when they see a potential user getting on. The seats also fold up to clear floor space for wheelchairs and strollers. And there are “seat belts” to keep a wheelchair stationary.
The buses also have mechanical ramps that unfold like a tongue for roll-on/roll-off access.
Most of the L train stations got elevators in the past 15 years. But some don’t.
Come to think of it, I don’t often see wheelchairs on the trains. Maybe because all the buses are so well equipped.