The amber/yellow lantern was used to mark "camp cars". Camp cars were railroad cars that track repair men or other repair people lived in when many miles from home. They ate and slept in them.
Switch tenders (people that manually threw the railroad switches) also used the amber/yellow lantern (or the green lantern) for signaling to indicate that the switches were aligned properly.
An amber/yellow lantern could also be hung as a tower signal to indicate that Form 19 orders were to be handed up to conductor and engineer. Form 19 orders are "hooped" (affixed to a stick with a hoop on it that the engineer could put his arm through to grab it) up to the engineer and conductor by the operator once the train is underway. In other words, the train did not have to stop to receive Form 19 orders.
To learn more about railroad signals, please visit http://www.jeffpolston.com/lantern.htm
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