Children's Picture book about people getting on a train/ bus or elevator. Read in 1980s/1990s.

[[deleted user]]

I read this picture book in the 80s/90s about a bunch of people getting on a subway/train/bus, maybe elevator. Unique characters, such as one with a plant, one with a cello, etc. The train fills up as more people get on. Illustrations facing the row of seats... please help and thank you!

[Kris]

OP (original poster) account is deleted. Moving to the "Now we'll never know" folder.