a Pennsylvania Railroad site, with a good PRR Interlocking Plant chart section

 a cool site about depots in Michigan

Another signal site, focusing on AT&SF signaling (many spectacular night photos!)

Railroad Signaling and Communication, with photos of preserved and in-service equipment

Semaphores.com (the name says it all)

Signal section of Trainweb's Railway Technical Pages

A whole site devoted to the lovely Wig-Wag signal

"The Railroad Signal Site" featuring excellent internal views of many types of North American signals

A site all about railroad applications of gyrating warning lights

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