Trainz

Quick question.
Is there a reference or guide line for how long trains cold be in the steam era? I understand that factors such as engine availability of grade over the give route could be factors. Most of the images i could find showed about 40-50. Does that seem right for a mild grade with something like a 2-8-4 Berkshire? I'm looking to set up some express AI trains pulling mixed consist or coal to run through my layout.
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