They were supposed to be on a transcontinental line there - talk about poetic license! The only explanation I can figure is that, in the fictional world, the dream of a continent-spanning 3' gauge system (the "cloverleaf") was completed, and the DSP&P actually lived up to its name. North by Northwest. Haven't seen it in a while, but definitely many scenes on the 20th Century, including a couple shots of lightning stripe E-units. And at the end, a brief scene of an SP passenger that I'll always remember for having mismatched engines, one in Daylight and one in then-new Bloody Nose.