Which Fuel to use - Coal or Gas?
This discussion is primarily for the larger scale live steam locomotives. There is nothing, that beats the sight, sound and smell of a coal fired locomotive. Many of the models, we intend to be as near to the prototype as possible. There are however circumstances that are made easier by gas firing (propane or butane). If the boiler has a relatively small grate (where the smaller dimension of the grate is 75 mm/ 3 inches or less) coal firing becomes much more of an art. This is not to say it is hard, it just requires more attention, and skill on the part of the engineer.

Why a gas fired engine?
For those of us who are new to this hobby, may find the prospect of tending the fire, watching the water level, controlling the blower etc. a little too much to cope with initially.
In these cases, firing the locomotive with gas is a good alternative, and allows more time to be spent doing our other duties.
Another reason considered for gas firing, is the relative ease of cleaning the locomotive without having to sweep the flues, clean the grate etc. Although a valid reason for some, we feel this is part of the joy of coal firing, and teaches us to properly maintain our engines.

COAL?
If you decide to use coal, ensure that it is of the highest quality, preferably Welsh steam coal.