George, it sounds like the 'steam methane reforming' processs you brought up earlier for hydrogen production. I think it's a fairly big leap to assume that's what was happening in your dad's locomotive. For one thing, the steam used in methane reforming is far hotter than the steam in a locomotive boiler. (700°C is about 1300°F) The other issue is that adding more fuel isn't going to generate much heat since there's already plenty of fuel in the firebox. It needs oxygen, not hydrogen to burn hotter. And the amount of hydrogen available in a shot of steam is going to be fairly small, since a little bit of water makes a lot of steam.
I don't claim to know how adding steam to the firebox worked for your dad. There are a lot of things going on here; for example the steam is going to release a huge amount of heat in the firebox that might somehow increase the heat transfer from the burning coal to the boiler.
I can't find any reference to adding steam to a locomotive firebox. I have found references to 'steam injectors', which were once used to add water to boilers, but not to the fire.
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