Soldiers : Heroes of WW2 Russian Mission

[Smeich]

I think its the 2nd last (4th?) Russian Mission.
Where you have to hook the train up to the Rocket launcher cart, and then drive it out the main gate.

Problem is , I hook it up all fine and well, guide the train up and down the tracks whilst switching the "lanes"
to get it out the main gate, but one of the last swtiches wont turn ! The train is sitting in the starting station , middle lane,
as far back as it can go , but my guy cant flip the lane changer switch (Its as if the train isnt far back enough).

Is this a bug or am I supposed to get rid of the coal cart ? (Which I have tried, but U cant reconnect anything)
Any help ?

Thanks in advance.