When an electric train like, say, one of the old class 303s, was sitting at the platform....
What was it that caused the all-pervaiding 'hum' noise you could hear when everything else about the train was quiet. Something to do with the 'electrics' I daresay. But WHICH part(s). What was the bit called that produced the 'hum'? And, perhaps more importantly, WHY did it 'hum'?
Daft questions maybe, but I've really been wanting to know the answers for years and years... I'm not technical...
Can anyone help? Much obliged if so.
Jim
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