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Diesels dont like slipping because the enigne will just give more power as the wheels spin faster it thinks it is working harder and responds accordingly. So wheel slip indicators cut the power to prevent current from surging into the traction motors where it isnt needed until grip is restored. Load a train too heavy stick it on a wet gradient which is curved and anything will slip. For any bogies of 4 axles with 8 wheels the amount of contact with the rail surface is about the same area as your finger nails!
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