FAQ:Railcom and NCE Decoders
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With an update to the NMRA DCC Specifications, older NCE multifunction decoders which were compliant are no longer. The issue arises when RailCom is active on the command station.
When RailCom is enabled, older NCE decoders may operate erratically or with unexpected results. Disabling RailCom prevents these issues should they arise. The solution is to replace non-compliant multifunction decoders so the benefits of having RailCom can be enjoyed.
Command stations made with RailCom on board cause this issue. Not all manufacturers support RailCom. Most older systems lack RailCom capability. See your manuals to learn if your system has RailCom.