No's 1 and 4 for me - I find that number 1 leads the eye nicely, and has a pleasurable feel to it.
No. 4 just has perfect composition with the old mining-town feel to the houses in the background.
Great shots, but I feel I have to agree with the comments on the selective colouring one - two items that strike me:
1) The bloke in colour is too small and insignificant a detail
2) Don't know what you can do about it, but the water tower (due to it's light shade) dominates the picture more than the train - was the engine colour really that bad?
Also like number 3, but it just doesn't have quite the panache of numbers 1 and 4 [that said, I'd be dead chuffed if it was one of mine!]