Quote:
Originally Posted by Beeyar Wunby
I'm guessing that the tank charges gently whilst the train idles in the station and so is fully topped-up by the time the train is ready to leave. When the train revs up the compressor runs faster but its output isn't needed straight away, therefore the excess blows off.
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I am not a train man at all (just a childhood passion) but what you say makes sense. Thanks.