I recently bought one of these units off of Micromark decorated in BNSF. Actually it is a RTR but it is based on Blue Box design. The unit runs fairly smooth right out of the box, but it needs some attention so I can use it on DCC.
Is there a detail kit available for this unit?
Check with Athearn. On eof my BB GP38-2’s was done up with a detail kit that had radiator fans, grills, grab irons, handrails, etc.
Bowser has a good brass detail kit. http://bowser-trains.com/hoother/calscale/190-524.htm
And you can get some pretty __fan__tastic fan kits from Cannon & Co.
Radiator fans
Dynamic brake fans
Those kits should give you one impressive GP38-2![:D]