I posted this in the subway forum, but didn't get a response. So I deleted it and moved it here.
Recently purchased a used R-26 Railking subway set. With a current lack of TIU's for DCS I have been told by multiple forum members that I can run it conventionally. So I did that today using a KW postwar transformer.
The KW puts puts out around 16 volts or so at full power (measured at the track), but it seems to require full power just to pull the four cars at a reasonable speed. The throttle is pretty much full. That's a first for amything I have run with the KW.
It is underpowered enough that it derails on 027 curves because the three heavy cars drag on the front powered car pulling the wheels it off the track on the curves and tripping the breaker. I have a 7.5 amp Sensata circuit breaker in line with the variable A terminal and a single TVS diode across the Lock on. It is a simple 4 x 8 layout.
I had multiple power taps, but for testing purposes I disconnected them all to favor a single lockon. I have a 2026, Williams GP38, MTH trolley, and a Williams steamer and none of them require that kind of power using the same setup.