Originally Posted by Bad Order Hal:
HEY NICK,
Your information on the Cajon Subdivision is the most welcome yet!
That's the line that runs through the Victor Valley (Victorville, Apple Valley, and Hesperia), between Barstow and San Bernardino. (I live in Apple Valley)
BTW, what is meant by 2MT and CTC in the Timetable and Railfan listings?
Bad Order
The "MT" stands for "main tracks", so 2MT indicates there are 2 main tracks along that section of the line. The Cajon Sub was expanded from 2 to 3 main tracks a few years ago. That required the removal of the only two tunnels in the Cajon Pass.
CTC is Centralized Traffic Control, a system by which track switches and signals at "controlled points" (CPs for short) are controlled remotely from a centralized dispatching center. In days gone by, this was most often accomplished using a code line on poles along the line (the wired technology being inherited from the telegraph system), but today much of the signal code is communicated by digital terrestrial radio, satellite, fiber optic and even via cell phone installations.
Here is an article on railroad traffic control systems from Trains Magazine.
Now you have your homework assignment for the remainder of the weekend.
Bet you thought you were going to get easy answers, didn't you.
BTW, I am tremendously envious of you. If I lived in Apple Valley I'd be on Cajon Pass like white on rice.
Have a great day, Sir!