Are the first 3 extreme crops or highly compressed jpg files (or phone pics)? They seem to be showing blocked up detail, jaggies on lines etc. The fourth image has those issues a little, but less than the others.
Number 2 has the best atmosphere, with the light striking the (slightly blurry) front of the train, though number 3 is close with that plume of smoke & steam.
Nice pictures - it just feels like they could be better.