mask layer with the train and change blending options to overlay
step 4 of 6
duplicate train layer, mask out all but piece of rails and smoke, and change blending option to Normal
step 5 of 6
Add picture of the guy mask out what I don't need, adjusted levels and hue saturation to match lightning conditions.
Select post from original source, copy, paste, Ctr+j, move, transform according to perspective, layer style: Drop shadow.