Can't you do:
position object 2,object position x(1),object position y(1),object position z(1) - 75
It would look bad if the train turns around though.
Something like this would be better:
Position object 2,newxvalue(object position x(1),wrapvalue(object angle y(1)-180),75),object position y(1),newzvalue(object position z(1),wrapvalue(object angle y(1)-180),75)
Also, if you want people to see the code, put it between these except without the space: [code ] [ /code]
http://forum.thegamecreators.com/?m=forum_view&t=62563&b=7
Edit: Reply to post below: No problem! (Don't want to bring this topic back from the dead...)

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