I've played TRS2010, I have it on my PC at home. I've also played TRS2006 which I thought was very good.
It's not the most realistic series of Train Sims as the graphics can go it bit strange sometimes. The junction control and signalling is a nightmare if you let the computer automatically drive the trains, as if you have 3 trains arrive at a junction, all wanting a platform... the results are interesting and often lead to derailment
Also if you crash 2 trains into each other as I did once by accident (Dad said i'd never make it as a signaller
), they don't derail but join as a complete consist. Another bug is that if you stop a train across a junction, you can drive another train through it
But on the whole, I found it very easy to use and it was good entertainment.
There is also Rail Simulator by EA, which does feature
FGW▸ stock. It's a much more advanced game with superb graphics which feature passengers actually walking down the platforms (Auran TRS they are static on the platform and just appear/disappear). But I found it quite difficult to use if you wanted to make up your own rolling stock consists or maps. Driving the things is quite realistic too, but it does need a fairly beefy machine to run. I didn't find it as easy to use as the Auran series, but thats possibly because it has so many features.
I haven't played Railworks or OpenBVE so I can't comment on those unfortunately.