Steam...

[Tom]

The SP 4-8-8-2 Cab Forwards (the museum right up the road in Sacramento has the only remaining example) is an oil fired engine, so getting the oil up to the firebox isn't a problem, just runs through a series of pipes. A col fired cab forward would likely have been impossible. The reason articulated locos will do smaller radius curves is because they are articulated, hinged between the two sets of drivers. The boiler overhangs even on the real ones in curves, so that IS prototypical.

If you like Northwest articulateds, might I suggest looking at this one?

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They are SWEET little runners and are DCC ready. They are big but run on 22" curves like clockwork. AND Great Northern is a Northwest Prototype.