The website has had an update explaining field diverts:
One very important aspect of Rail Simulator is the Physics of the simulation, which has required (and still requires!) a substantial pool of our resources at Kuju. In order to make the train simulation as realistic as possible, we have a team of programmers dedicated to the development of the Physics / Simulation code, and one particular part of what the code is trying to emulate is Field Diverts.
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Filed Diverts will feature in KRS and all of its relevant locomotives; users will be able to input how many field diverts a loco has, and the speed and amperes at which they operate. This system will greatly enhance the user's experience of KRS, giving more realism to real world locomotives.
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http://www.railsi...iverts.htm