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  Accept the laws of physics, but a train weighs many tons, whereas passengers weigh very little in comparison. A train can weigh as much as 250 - 500 tons and the energy required to move that load won't change much if you add 250 passengers. At 10 stone each you are only adding 15.6 tons to the weight.
  
  I acknowledge it will require some extra power, but not that much to make a significant difference to fuel costs. I also think 250 free passengers on every off-peak train is very unlikely

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