The last one is my fav - all ncie shots though
Number 1 is great. The others seem a little overexposed, or over post processed. The grass in number 3 for example looks very unnatural, and the whole image seems to be a bit blue, as if a cooling filter has been applied.
The composition in 2 is good, but it is slanted. This isn't always a bad thing, but in this case it looks as though she is leaning on the train, and the train is leaning on her in return. It might just be me but it bugs me every time I look at the image.