FAQ:If a packet is lost due to dirty track, what happens?
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Command stations retransmit packets to multifunction digital decoders as often as possible, so if a packet is lost or corrupted, another one with the same information will arrive soon after.
If power to the locomotive is interrupted for long enough, the multifunction decoder goes into reset mode - and stops the locomotive. When power is restored, it will not move until it gets a new packet.
There is a danger that if the multifunction decoder is configured for an Alternate Power Source, a runaway will occur. The cause is a malformed digital signal which causes the decoder to switch to Analog mode, and applies full track power to the motor.
Good wiring and clean track are essential.