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Mike, I'm not sure what "era" you saw this, but it does make a big difference. In the "steam days", you needed slack to get the train started. With diesels, the low speed pulling power would dictate that you kept the train stretched. Not an issue with a 20 car local, but if you have 100 cars, or so, you have to be VERY careful not to apply too much power until your whole train is moving. If you apply too much amperage, too fast, you will start pulling drawbars. Not a good thing. <br />Hope this answers your question. <br />Todd C.
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