Lots of good information in this thread -- thanks to everyone who has pitched-in with advice!
The first stuff I heard was police related but apparently we have a trunking system because you could only hear a tiny bit before it cut out again. D'oh! I ended up taking the scanner with me to the station when I went to go pickup some more tickets and get a voucher. I used my mobile phone to grab the local frequency chart from the web and picked up some train transmissions but it was hard to figure out what they were talking about. Unlike the pros on YouTube I had no idea what was going on or where the "rockport sub" was or pretty much anything else they said. Dang it.
That will come with time. A lot of the procedures and jargon get repeated often enough that you'll be familiar with it in no time. Here's a bit of a crash course:
1) Track Warrants -- oddly enough, as I began typing this, my scanner came to life with a dispatcher issuing a track warrant. These can be confusing at first, but what I did was go to a website and print a sample Track Warrant. You'll see all the boxes that can be checked and filled in. Here's a sample:
Track Warrant. So, you might hear a conversation like this:
Dispatcher: "UP Dispatcher 39 to the UP4910 at Jefferson, over."
Train: "UP4910, over."
D: "I have a track warrant for you to copy, over."
T: "Go ahead dispatcher."
D: "Track warrant 27, June 2, 2010 to the UP4910 at Jefferson, check box one, track warrant 26 is void. Check box two, proceed from Jefferson to Texarkana on main track, check box six, authority expires at 12:00. Check box 8, hold main track at last named point (Texarkana.)
T: "Ok, dispatcher, track warrant 27 on June 2, 2010 to the UP4910 at Jefferson, x box one, track warrant 26 is void. X box two, proceed from Jefferson to Texarkana on main track, x box six, authority good until 12:00, x box 8, hold main track at last named point, over.
D: "That is correct, OK by BTH (dispatcher's initials) at 11:07."
T: "Ok by BTH at 11:07, UP4910 out."
Other fairly common things to hear would be a conductor or brakeman call for either "three point protection," which is what they ask for when climbing between cars. Three point means that 1) the reverser is centered/removed, 2) brakes are set, 3) traction motors are disengaged. The train cannot move or undo any of those things until the person that called for the protection releases the protection. Lots of times, you'll hear the brakeman call for "set and center" which refers to a setting of the brakes and a centering of the reverser.
Sometimes, if an absolute signal is malfunctioning, a train will call the dispatcher (you'll generally hear a series of tones, similar to when dialing a cell phone) and get permission to pass.
Depending on the road and rulebook, generally when trains pass each other, a member of the waiting train will do a roll by inspection of the passing train, and transmit to that engineer once he's past. "Rollby looks good UP4910; marker is lit, highball."
Sometimes crews will call signal indications over the radio--this happens here on the KCS when passing the UP-owned interlocker. "KCS2330 clear block at Jefferson."
If there are track crews working, the conductor of any trains approaching that area will have it in a bulletin, and will call ahead to receive permission for his train to enter/pass the crew. The track foreman gives this permission, and usually will request the bell to be rung and the engine crew to be on the lookout for men and equipment.
Yeah I wish I knew where these things were. As it is I'm still using the train horns instead of the scanner. Is it just a matter of driving around aimlessly or are these listed in the system timetable or elsewhere?
They're listed in the system timetable. You might check online (usually at the local BLET union's website) to see if there are track profiles available.
Track profile On that one, you get lots of useful information, including the location of all signals, mileposts, control points, defect detectors (they're the little green circles with a triangle inside,) speed limits, etc. If you can't find any like that, you can check out the published railroad atlas for your region.
Lots of times, an employee will give you an expired system timetable if you ask. They're also available on eBay.