The drive in this model is profound. Quiet, smooth, POWERFUL. On DC with three in tandem the amp meter never moves.. dead steady. Less than half an amp.. 10 volts about 40 SMPH... PERFECT.
A club member and sales associate from Caboose Hobbies once stated to me that the Tank Drive was, "out of date, old fashioned, and in other words j-u-n-k..." Importers don't use it any longer. Hmmmm.
Key's current drive is roughly based on this Tank Samhongsa Drive. Add ball bearings everywhere and the best rare earth magnet motors available and nothing I mean nothing will out-pull, out-perform, or out-smooth this drive, ever.
Lots of arguments are out there about both, the old argument was the tower drive would prevent interior detail and it does but OMI managed pretty well with the Ajin tower drive.. I like the tower drive, in HO it is best. But in O scale its a whole different ball park.
You simply have to see these Samhongsa T2's run together.. 4 of them will haul anything, rock steady... perfect.