Our resident leprechaun reckons they are used to put out burning villages in Switzerland. I know, I know, I should have twigged, he’s wrong as usual.Grrrrr !
How many times? Fire trains are not for fighting those fires, they are for fires on the railways.
Just like airport fire engines are for plane fires, not local buildings.
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I’m still not sure that a fire train is the best asset for a train fire. By the time it reaches the burning wagons there will be nothing left. I think it would be a case of jumping out and letting it burn, then send recovery / repair gear to clean up the mess.