This update is brought to you by the letter “T”, for books T-1 thru 4, labeled “Train Control” and “Cab Signals“.   Photos of Type E, EL, and CY cab signal equipment can be found in the  Cab signals album, as well as several  albums  grouped together by railroad.  To the right is a photo from Southern Pacific’s San Francisco Oakland Bay Bridge installation, dated August 3, 1939.

There’s also US&S Shop Photos, including this one, labeled “Exhibition Room display of ‘Union’ Cab Signal & Speed Control System”  –  displaying Type-E Cab Signal equipment and related apparatus.   Enjoy!