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As far i understood may it was a tractor for missiles...
Correct. I picked up several of thse during my excursions into East Berlin way back in the day:
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If I find the appropriate tires from a Roco kit I may sacrifice one of them to make one.
If not, I'll do something like this:
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Iraq used several different similar locomotives, one of which is closer to the one I have. The registration numbers are even available online.
Gutzold actually makes the locomotive in the photo. It might be worth getting.