Northe
Member
In December, 2009, I began hearing what was probably testing of two radio-controlled switches on the UP Nogales subdivision between Tucson and Nogales in Southern Arizona. Initially the switches were operating on a normally-unused channel, and the voices were male.
Within a couple of weeks the switches were operating on the Nogales Subdivision road channel (160.785), and the voices were female. It appears that the switches are controlled using DTMF tones on the road channel.
I'm located near MP 25.9 on the subdivision, and the switches are at MPs 23.00 and 24.65 (north of my location) -- possibly related to a spur to one of our nearby copper mines.
I'm wondering whether radio-controlled switches are unusual on the UP and other railroads or whether they are widely used. I haven't seen any mention of them.
Northe
N6KO
Green Valley, AZ
Within a couple of weeks the switches were operating on the Nogales Subdivision road channel (160.785), and the voices were female. It appears that the switches are controlled using DTMF tones on the road channel.
I'm located near MP 25.9 on the subdivision, and the switches are at MPs 23.00 and 24.65 (north of my location) -- possibly related to a spur to one of our nearby copper mines.
I'm wondering whether radio-controlled switches are unusual on the UP and other railroads or whether they are widely used. I haven't seen any mention of them.
Northe
N6KO
Green Valley, AZ