Dear, Bach Man :
I had a #25757 On30 28 ton two truck Climax I rcvd. it around Dec. of '07. It had a problem in both forward & reverse directions. The piston rods were moving & the ecentric was revolving but there was no drive of the drive shafts to the trucks. Even with a modest load it had this problem and even with the engine alone. It had very little running time. Less than 30 minutes. Well I returned it to Bachmann and they sent me a replacement and it virtualy has the same problem...Is this just the "nature of the beast" an engineering defect or what do you think???