I am running an LGB Jumbo (10 amps advertised) and I have been running 6 motors in 4 Locos with no trouble. Running Uintah 51 , DCC Starter Diesel, Chloe, Starter set Steamer and related powered tender. The meter on the Jumbo reads 24 volts and sometimes, when everything seems to be going up hill, I see the ammeter move. I pull between 4 and 10 cars with steel wheels on most. Chloe has trouble with more than 3 on the grades. This is all on a LGB/Lenz MTS system and 300 feet of LGB track, unsoldered and unclamped. It has been in the real world for almost 5 years and the grades are 3.5% or less.