Wait .... what ? You were running your trains using the dial on THAT power supply ? It outputs AC line voltage - how were you running your DC trains with it ? You could melt stuff with that thing !
I'm running the output through a bridge rectifier. As to the voltage, sorry, I left out an important part of the equation. I run the variable 0-120 output into a 120/12 transformer then to the rectifier. The variable transformer is really only being used for the rheostat. The track voltage never gets above about 14v max. I realize it sounds like a Rube Goldberg setup, which it is, but it was all free stuff when this layout was built a few decades ago. Anyway, I'm going to tear it all out and probably go with the Power Cab starter setup. Should be more than adequate for what I'm doing here.