Bridge class is also use for temporary bridging (not sure about MGB or bailey) to record daily tonnage for servicing, for example on the Leopard AVLB it had a total usable tonnage of 2000tons at up to 50ton at a time (from memory) so the AVLB crew could add up the bridge classes of the vehicles crossing. Once the usable tonnage was reached the bridge could be serviced, inspected or replaced. We would start at 2000 and count down.
Regards Easo
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