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Reply to "Lionel 6-65530 unload control button"

The Lionel 90C controller is a 2-terminal momentary push-button single-pole switch that closes a single circuit.

lionel 90

Each button in the UCS controller closes two circuits - as can be decoded by studying what I call the "stacked-leaf" design in this widely available diagram:

figure 6

Hence the previous link to a dual-pole switch to exactly emulate the connections made by the original 2-button controller.

But all is not lost.  Take a look at this OGR thread.  You have to slog thru the fine-print but for the vast majority of applications you should be able to perform the uncoupling function with a single-pole switch and, separately, perform the unloading function with a single-pole switch.

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