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I don't have a USA trains GP9 to compare but going on there other diesels the fans will lift out. It is easy to plug the holes with styrene and then redrill for the new fans, I've just done this to reposition the fans on a GP38-2. You should'nt have to cut out any of the roof section. New 48" should be available from USA Trains. There is a yahoo group for modifying 1/29th diesels and I'm sure there in the files there are some photographs of GP9 and GP7 rebuilds.

Colin Stewart
Inverness
Scotland
 

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Kurt

You miss understood me, the fan units themselves pop out of the roof on USA trains diesels (GP38 & 30 - I assume the others are the same) so to replace the 2 x 36" fans I would pop out the fans, cut styrene circles to fit the holes with a compass cutter; glue them in place and then cut a new hole for the single 48" fan. No need to cut the roof

Colin
 
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