Maybe the red stands for the color of the firetrucks that keep having to be called

It would be amusing (and appropriate) to create a Bingo-style card to hand out to passengers, with various Red Line T stops in each square, and each time a station catches fire, they can check off that square.

Then, sometime soon, probably next week, you'll see a passenger on the train stand up excitedly and shout "BINGO!" Their prize? A free trip on a shuttle bus that may or may not arrive. And may or may not itself catch on fire.