update.
changes:
wider column width on elevated white tracks
toned down the brightness of the white concrete, turned up texture size so you can actually see textures in the game.
fixed column height for bridge
the gaps or indents on the diagonals are there on purpose because they'll protrude on a diagonal to straight if the ends are to be flush with diagonal to diagonal (it's a compromise).
as you can probably see, the elevated track columns don't extend down far enough for a "proper looking" double stack. if they did, they'll look weird on the ground (again, compromise)
I have no idea why the head unit on the freight train has that gap. sometimes it's there, sometimes it's not, oddity. I also have no idea what the internal names are for the piece goods and cooled goods, but there are several loaded cargo container images to choose from, and they can be flipped backwards for double the amount.
completed the on-track signals. They should be pretty clear as to which one is what, otherwise I fail my mission in making simple signals. I think They might need a few more pixels as I think it's a bit hard to see what they are when zoomed out. :p

icons for track signals are a on this shot, hasn't changed
http://i199.photobucket.com/albums/aa131/AEObikes/simscrmag.jpg