Reply to "Is a 100-Watt transformer adequate for a Std. Gauge trolley and a lot of mainline?"

I'm looking at a Lionel 1924 catalog (repro).  On the transformer page, they say the Type T, 100 watts, will operate any standard gauge train outfit and that a Type B, 50 watts, would run any O gauge outfit.  Standard gauge outfits included some twin motor locomotives.  50 watts ought to be enough for a single motor pulling no cars.

You might want to check the voltage.  Seems to me that some of those older motors were designed for higher voltage.  All transformers in the days they made standard gauge went up to 25 volts.  Many postwar transformers were 19 volts or less.  Look for a "Trainmaster" Type Q, A or S.