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speed in km/h shows the speed reported from the loco decoder via Railcom

Railcom feedbacks are defined in the RCN-217
RCN-217 is the reference document for DCC

The implementation of the speed reporting feature in a loco decoder (or not) is the individual decision of the respective decoder manufacturer

Currently known manufacturers status (incomplete list), as of 03/2022:

The speed reporting has to be calibrated when first time using a decoder in a loco, using e.g. speed measure in a block or similar. See decoder manual for the relevant configuration variables.

In the technical view, the speed information is generated by the EMF of the motor

Once calibrated the decoder reports the true speed at any speed level, independent from decoder-defined speed curves or other influences

Prerequisites for this feature

• DCC
• Railcom decoder with the implemented feature "true speed"
• Railcom is supported by sensors and central station