I would imagine even American loco's have DSD fitted and this would stop the train from being able to move without a driver in the cab. Unless, someone released the air in every wagon and isolated the DSD on the loco making the whole trin a 'swinger'.
Hey, I was just futzing around on the internetz and came across the forum... and this thread! I'm a Conductor for CSX in the US and I can shed a bit of light I think...
I'm not sure what a "DSD" is but I assume you're talking about a "dead man's switch" of some kind where it beeps every now and then and if the Engineer doesn't press a button or whatever, it automatically stops the train? Yes, our locomotives do have these. However, in this particular situation, the Engineer had applied the independent brake before exiting the locomotive, so that auto-shutdown system wasn't enabled (I imagine the system assumes that since the brake is applied the locomotive will be stopped).
The reason the train continued on is because, aside from the independent brake, the Engineer also tried to set the dynamic brake before exiting the locomotive. Unfortunately he accidentally kept the traction motors set for power rather than dynamic braking, and so the train sped off after he dismounted.
Oh and no... no the Engineer definitely shouldn't have been getting down to line that switch. That IS what happened in the real incident so I'm wondering where his Conductor was at? Either way it's a big no no... granted, back when all this happened safety rules were a bit more lax. But beyond that, back then Trainmasters did a bit more of just turning a blind eye to what crews did so long as they got the work done and got it done quickly. Smaller derailments could be pushed under the rug, run through switches, that kind of thing.
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My understanding is that it is not uncommon in 'dark' areas (i.e., unsignalled areas) for the drivers to have to stop the train to change the points if it is to be looped or put into a siding. However, the train would obviously have to be appropriately stopped and secured prior to leaving the cab. Movement authority in this environment is provided through the use of 'train orders', which are often radioed through. A train order will, for example, state that your train must enter the loop at a certain location, and is not to be moved until it has been passed by another train, and the number of this train will be given.
The integrity of the train is monitored by remote axle counters, which broadcast the axle count on an open radio frequency. It is up to the driver to ensure the appropriate number of axles have entered/left a section, and to declare an emergency by radio if their train has become divided.
Others may know more, but I believe all US trains have to be continuously braked as an additional mitigation against the risks involved with a divided train, and that it is atypical for the train being met (as per the train order) to be a same-direction movement.
Finally, I understand it is normal for trains to carry two drivers when working in 'dark' territory, in part because of the limited mess & depot facilities out in small-town USA, and in part because then one driver can stay with the train while the other attends to any line-side duties.
As with the UK, I understand that generally the largest risks on the railroad come from some dumb idiot stalling their 100ft rig on a level crossing, or playing race-the-train.
I would add that 'Positive Train Control' systems (i.e., TPWS / ATP) are still relatively rare in the US, but are becoming mandatory on certain lines with higher risk traffic (passengers, chemicals...)
Sort of right, sort of not.
Yes, all trains in the US require two man crews, whether in signaled or non-signaled territory. Engineer and Conductor. The Engineer drives of course and the Conductor talks with the dispatcher, keeps up with paperwork and all that sort of thing. Conductor also calls signals in signaled territory and just in general provides a second set of eyes.
Calling signals is just as it sounds... you just hop on the radio and say something to the effect of "Q49721, lead engine CSXT 4677, slow clear on the East Yard Lead, lead to the main, northbound. Q49721 out."
Train Orders haven't been used for controlling train movement in, well... decades I imagine. I mean we still get "orders" but they're mostly just messages from the dispatcher regarding slow orders, work authorities, heat warnings, places that trains have been tied down on sidings or something... that sort of thing. For CSX, movement in unsignaled (or "dark") territory is controlled by EC-1 forms. Say you're waiting at a yard in dark territory waiting to make a run down the main. Well you ring up the dispatcher and he'll give you authority on a certain amount of territory. For us it might be something like "Operate on the main train, north direction from the SAS North End of Freedom, main track to the SF 327.1, main track. "SAS North End of Freedom" being the "Southward-facing absolute signal at the north end of Freedom Siding" which is the last signal before dark territory starts and "SF 327.1" being a milepost. The dispatcher will read all this out to you, you write it down and read it back to him and then he'll tell you it's "OK and effective at XXXX time" and give you his initials. Also, when throwing switches in dark territory, the dispatcher has to give you permission to operate them on that same EC-1 form. Then you have to keep track of the milepost for each switch, when you first threw it and the time you restored it for the main. The dispatcher will take all this info back from you after you give up your territory to ensure all manually operated switches are lined and locked for the main.
Let's see, what else, uhhh... yeah, all trains are continuously braked and have to have a brake test before getting on the main, there's different kinds but a road train will get what's called a "Class 1" that depending on how long the train is can take an hour or more. But if the train divides the crew knows it pretty much immediately... as soon as the hoses between the cars where they pulled a knuckle come apart, the whole train will go into emergency and thus stop. At which point the Conductor has to walk back to find where the cut is... sucks if it's, y'know... 80 cars back on a 100 car train, lol. Usually the spare knuckles are on the locomotive so he'll go back to the locomotive, drop the knuckle on the ground, pull the train ahead, load the knuckle up on the last car and then shove back to where the other half of the train is because... well knuckles are heavy, haha.