Southern Pacific's "Overland" is under the charge of cab forward locomotives on different days. We also see them in freight service. From the Pentrex show "Southern Pacific Cab Forward Collection" https://rfd.video/PentrexCabForward | Steam Giants

A steam locomotive is a machine that propels itself and other vehicles by means of the expansion of steam. [1]: 80 It is fueled by combustible material (usually coal, oil or, rarely, wood) which is burned in the firebox to heat water in the locomotive’s boiler into steam. As a gas, the waters volume is 1,700 times greater than as a liquid! In most locomotives, the steam is admitted alternately into each end of the cylinders to move the pistons back and forth. This lateral motion (or reciprocatin