I've done some investigation and it would appear that the socket trip switch (actually a current leakage trip) is rated at 30mA. Odds are the socket trip switch is not as fast as the coach circuit breaker so when a fault occurs the main trip switch is pulled faster than the socket one. So either the wrong type or rating
All other on train sockets on all other fleets are rated at 20mA trip current, where as the coach circuit breaker would be 30mA (standard home rating for an entire house)
For reference its the pesky trip switch on your home fuseboard, the big one with the reset button that kills all your sockets that is the problem on the train
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