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<p>Which brings up a question I have had forever.  If you have a long train- say, a Norfolk Western coal train with a steam locomotive on one end, and a helper on the other- what means of communication were used to synchronize the efforts of lead locomotive and helper?  Using the whistle comes immediately to mind, but how did a locomotive engineer on the lead end tell the back end to increase his "push"?  No radios- no telephones that I am aware of- and a trainman standing on a caboose platform ready to pull a pin when the helper reached the top of the hill.</p><p>All I can come up with is that the engineer must have had some way of knowing when to push harder, and when to ease off- maybe by touch?</p>
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