Can anyone provide additional info on these relays? How they work? Are these types still in service somewhere? etc.....
The first one has a metal plate that reads:
Type K D.C. Interlocking
General Railway Signal Company
Rochester, NY
Also there are 2 stickers that appear to include calibration/inspection dates(?) - these are hand written and very faded but the dates look like 1937 & 1957.
The 2 smaller relays have metal plates that read:
DN-22 Neutral D.C. Relay
Union Switch and Signal
Swissvale, PA
They both have stickers with handwritten info. The dates are clearly 9-25-57 on one and 3-13-74 on the other. Thanks for any info!
Tom B
http://www.photos.jcstudiosinc...3_0102relays0002.jpg