Signaling techniques for DC track powered model railroads

  • US RE42,284 E1
  • Filed: 10/31/2007
  • Issued: 04/12/2011
  • Est. Priority Date: 11/16/1984
  • Status: Expired due to Term
First Claim
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1. A model train locomotive for use on a model railroad track that is coupled to a power supply for controllably applying a polarity-reversible DC track power signal to the track, the locomotive comprising:

  • a motor for driving the locomotive over the track;

    means for isolating the motor from the track so as to allow use of polarity-reversals on the track power signal for controlling remote effects; and

    means responsive to polarity-reversals on the DC track power signal for controlling remote effects without reversing the motor. wherein the DC track power signal consists of an adjustable-voltage electric current having a single, selected polarity except when at least one polarity-reversal occurs for controlling remote effects.

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