Gentlemen, this was some very interesting reading. The interaction between dispatcher, tower operator and trains back in the old days reminds me of a well-tuned, well-rehearsed symphony orchestra.
Somewhere in southern Indiana there is a line dispatched with TWC except for a CTC ‘island’ of one siding. IIRC, their track warrant would take them to he first CTC signal where they would proceed on signal indication to clear the main at last named point, or something similar.
Web page of the NRHs’ preserved PRR/ PC/ CR/ Amtrak (?) Harris Tower in Harrisburg, PA:
http://harrisburgnrhs.org/Harris.htm
13 photos page - levers, model board, 'guts", etc.:
http://harrisburgnrhs.org/HarrisRest.htm
Some links to Hunt Tower, Huntingdon, PA. At one time it was open to the public on certain days, but I can’t easily find info on that:
https://www.flickr.com/photos/mark_vogel/2079917490
https://www.pinterest.com/pin/189291990558138825/
http://www.rrpicturearchives.net/showPicture.aspx?id=4521949
You could do a search to see if you can find more.
- PDN.