Listen up — grammar/spelling correction time: I maintain that subway trains have “cars” not “carts.” Since you are writing a lot on the subway train, I thought I might step in here and note this common error that I encounter in many a student’s work.

Want proof? Check out the work of photographer Stephen Mallon who documented the MTA’s project to use old subway cars to create coral reefs.

You can read about the MTA’s reefing project.

This is the artist’s website.

And in case you haven’t had enough “car” trouble from me, here is a thing about trains in general: