JTrains posted:RoyBoy posted:Just get a postwar American Flyer or Lionel transformer and put a bridge rectifier between the out put and the track. Simple and cheap.
True - but without some filtering on the BR's output you then have a huge 120Hz ripple in the resulting DC. It certainly will work - but with that amount of ripple I'm not sure that any "benefits" of running a universal motor on DC would still accrue.
There are no benefits to running a series wound universal motor on DC. They run the same as they do on AC.