On30 Climax

[Shayster]

 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???