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Reply to "Any one order the Trainworld Berkshire"

The FlyerChief steam engines use a 4 conductor drawbar connector. There is no rear tender LED in the Berkshire because 4 conductors do not allow both a backup light and an electrocoupler. The FlyerChief Polar Express engine does not have an electrocoupler so it has a working backup light. Carl Tuveson developed a multiplexer to put both the light and the electrocoupler on one wire.

All my electrocouplers work reliably at 14.8V to 15V on the track. The difference could be that I am using a ZW-L which outputs a non-sinusoidal "sharktooth" waveform at reduced voltages. The couplers may respond better to this output.

According to the Gilbert Service Manual the 30B outputs 18V. Try using the fixed 18V output terminals rather than the variable. With FlyerChief engines and the App there is no need to have the variable rollers in the circuit, it may work better.

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