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In years gone by there was a huffing and puffing bit on the front that mostly bore no resemblance to what it was pulling whereas these days what is on the front often looks the same as the back and others look like the bits in between. It follows that there was an engine in in older times at the front followed by a train behind it but now with all looking more or less the same we only have a train.
Ducking behind the coal bunker now.
John
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