Looking good. Id drop the scale on the grass. At mo it looks like each blade is a few feet long. It could do with better blend onto the gravel too. How to do that. Well you can get a mask and fade it out and add two textures or you can generate a stamp type brush of some partial grass partial gravel and put some of those down on the blend line.
The house looks fine, the platform looks fine tho bare at mo. No theres not a lot wrong with it so far.
Theres lots of web sites with dioramas of 1940's stuff with model trains, tanks and so on. Because this is a station I would think that there would be some images of platforms as reference. Also a no end of holywood films set in 1940's around platforms too. You didnt say which country its based on but theres probably a selection of historical pics to reference too. I would think that all the trains were steam at that time (not an expert) so coal bunkers and water tanks and all that gear could be added.