French translation: relais d'enclenchement de la puissance
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When all doors are closed, this series circuit runs through all the energized SLRs in the train, and energizes a relay, PIR (Power Interlock Relay), that is one of the required relays that must be energized to allow the Engineer to have the train draw power... Note that the M-7 has additional ways to ascertain what door(s) are problematic. And the basic PIR function in the M-7 is called TIR- Traction Interlock Relay. http://www.railroad.net/forums/viewtopic.php?t=2516&start=15...