Kuju Entertainment who were part of creating the first MSTS is comming out with their own train sim. The tilte of the new sim is Rail Simulator. You can check out what they have come up so far in the development stage.
http://www.railsimulator.com/en/index.htm. I don't know if it will be better then the new MSTS being created. Also since it is being created in the UK it may not have that many us train routes it may be geared more toward Euorpe's rails systems.
http://www.railsimulator.com/en/index.htm. I don't know if it will be better then the new MSTS being created. Also since it is being created in the UK it may not have that many us train routes it may be geared more toward Euorpe's rails systems.