I've only just caught up with this thread. There is a lot of good modelling there. The whole thing seems to 'gel' quite nicely if you see what I mean. I particularly like the ballasting and the buildings. However, there is one thing that I would criticise - the white platform edging seems far too wide and too white; it almost glows! If I were you, I would paint most of it grey to represent paving slabs with only 1 to 2mm a dirty white at the edges. (I hope that you don't mind me mentioning this.)
Robert