I'm watching The Sheepman (1958), a western starring Glenn Ford.
One of the early scenes shows a train (locomotive) coming into town. It is belching black smoke. A few seconds later the train is shown to be using wood as fuel.
Burning wood would never produce black smoke. Did the director actually insist on coal (or a few car tyres) for dramatic/visual reasons?
@fitheach My guess is all they had was a coal-burning locomotive they dressed with wood