Gregg posted:
No. NOT a steam line nor a what line. Remember that the photo is in Chicago. That line is WAY too small for steam, nor is it insulated for either steam or water.
Just because you never heard of air operated switch machines, does NOT mean they didn't exist. As Number90 stated, LAUPT had ALL air powered switch machines, plus the DL&W had ALL air powered switch machines in Hoboken Terminal, Grove Street Tower, and Summit Tower, to name just a very few on the DL&W.