I'm pretty sure FCT's only speed up DLS access speeds, not downloading the actual game itself so that wouldn't make any difference to your download speeds. The fact is that TRS 2010 is a huge program, so even on so-called 'fast' broadband it's going to take a fair while to download. All you can do is be patient and maybe do something else while it's downloading (or, leave it on overnight while you sleep, it should be done in the morning).
You could also try tracking a physical copy of the game down at any game store if waiting for the download to complete is too much (my local suburban EB Games store has several copies for sale still on the shelf, which is where I've bought all my versions of Trainz from), so you should be able to find a copy for sale without too much trouble.