I think the concern is that the current pits/surface mines have a limited operational life and with environmental concerns urging the government to eliminate coal use, then even if the heritage railways can secure an exemption from the environmental regulations, a continued supply would be needed - the new proposed mine would continue to operate after some of the others have ceased production. Without it, the heritage railways would become ever more reliant on imported coal.
There's a lot of ifs and buts though!
Tony
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