Content → Objects → Operators & Trains

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  Link Locomotives and Trains

Option All: all functions of the locomotive are synchronised with the cars.
Option Shift: with this option active the normal dispatched loco function will be rejected.
Option Description: only functions of the cars that match the description of the locomotive's functions are synchronised.

With the shift, ^, button activated the train function text/icons are displayed in the loco throttle.
Shift functions are only send to the train and not to the loco decoder.