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  Brian
  actually Betteshanger coal was ok for steam use with an excellent calorific value and with skillful firing, clinkering could be avoided-which was a bit of a problem. The comparitively larger grates and fireboxes on the Southern Locomotives were suited to lower grade fuels anyhow. Welsh steam coal of high calorific value was generally used on Western locomotives which had comparatively small fireboxes for the power of machine. Yes indifferent foreign coal has caused problems with steam on the main line,but the skill of the fireman also comes into play here. Also if you go for the cheaper grade(and there is a choice)-you get what you pay for.

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