I agree 110%! If I'm chatting with my mate on teamspeak (and not paying full attention) and come around a blind corner to find a box car (or worse a loco coming the other way) what I DONT want to see happen is:the trains should tip when going around turns too fast, and it should be realistic physics. No sliding for miles after leaving the track. The train should pretty much slow down to a stop after a few hundred feet to a few hundred yards. Also the train cars should do similar to what the train cars did in the movie Hancock, (but only if it is feasable. As in the right speed, the right amount of stopping of the engine, ect)
Also if a car runs the grade crossing and gets hit by the train it should be flung by the engine(again no crumpling or gore) and the engine should have a slight chance of derailing, depending on what type of vehical it is. Also maybe have some spillable products. like when you make a product such as coal you have to make the spilled version of it too.
1) the 2 trains connect up and stop as tho nothing has happened (errr... right....

or
2) the 2 trains turn into ghosts and are able to go through objects and slide along for the next 2k's or so :hehe:.
Yes this is a train simulator (which is what I bought all of the Trainz for), and as such I want an accident to be that, not a 'time for all laws of physics to go out of the window' just because a single bogie has derailed. And also I dont understand why there isnt a train crane that can bring trains back onto the tracks and take them to a workshop for repair (would do well as a job), not the silly 'train uses star trek teleportation to get to a portal where it come out as good as new' technique.
As for it being too hard for a PC to do, if your PC cant do a simple thing as detect when 2 objects hit and act accordingly (and since u can run Trainz which does that when ur box car derails and slides up that 20foot mountain) then I say get a new PC, because any semi decent PC can do a simple task like that.
And no it wont ruin the 'G' rating, where the hell people got the idea that a carraige rolling on its side will make it M rated I dont know, Thomas the tank engine had scenes where a loco smashed cars apart, and it was a kids show. So get over it.