Drawing a line had already been taken !
Blokes on trains... something so ineffably English about them.
Different faces, different ages, different postures. Nah there's too much variation for it to become a bit samey. You do such a great job of catching the character as wll.
I have ridden in trains many times. Commuter trains, cross country trains, there is always a variety of people. You have done a good job in capturing the moods of the people you sketch.
Speed drawing! Draw people out on the platform when you're waiting at a station - which'll prpbably give you 30 seconds a drawing - or maybe you can just try to remember what they looked like once you're moving again. Alternatively if it's an express just draw them as a series of smudged parallel lines as you pass through
Wow super linework
I wish we had trains here. All we have are metros and I rarely ride on one. Cabs are my bestfriends. I must try sketching people.