>> ......Steam locos (in the UK*) run best on Welsh coal.....
>> *you design the loco for your available fuel.
>>
...certainly the ex-GWR locos did, but the 1948 interchange trials showed the effects of designing for the fuel used. The GWR engines ended up at a disadvantage as the fuel used was from Midlands and Northern pits (e.g. Blidworth, South Kirby...) and favoured the LNER and LMS participants' firing characteristics.
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