We had the Bugaboo out, which I carried up and down stairs. That's the easy part.
Tonight, we got off at a station that turned out to have no exits except the narrow turnstile shown here. What we had to do:
1. one person goes through with diaper bag.
2. detach base/frame, fold it flat, and feed it through the turnstile.
3. pass the bassinet--which just barely fit--through, with the kid in it.
5. haul up stairs
6. curse the Transit Authority under my breath.