Interlocking Tower Audio Recordings

I've featured the work of the Youtube channel Railroad Media Archives before, but in the last few weeks they have taken a page from Evan Doobell's playbook with interlocking tower audio recordings from the 1960's and 70's. As you might be aware, the ability to capture long duration video information lagged the ability to capture long duration audio information by something like 5 decades. This means that recordings of interlocking tower operations in an audio/video format wasn't really feasible until the late 1970's, at which point everyone's favorite flags had fallen and conglomerates like Conrail and Amtrak were large and in charge.  While a great deal of vintage signaling technology was in use up through the 80's, 90's and Today, radio was well established along with its attendant operating practices such as track warrant control. 

Anyway,  Railroad Media Archives has so far posted three of these tower audio recordings covering HEATH and SUMMIT towers on the joint PRR-B&O C&N (Columbus & Newark) Railroad in Central Ohio as well as HIGH ST and MOUNDS towers in Columbus, OH. 

Hopefully we'll get to hear more of these sorts of recordings. They can certainly come in handy for any time one might be otherwise inclined to listen to radio.