The Chicago El has warming stations on the platforms. They make me feel like a fast food French fry but when that winter wind blows I'm glad they're there! This is about a "three trains gone by" sketch.
I've been using the large Moleskine watercolor book for Monday sketching. At about 8 x 11 it's a bit of a pain to lug around but since I'm trying to push out of my comfort zone and work bigger – you do what you gotta do!