Can somebody help me. I have been reading the TRAINS special edition on CSX.
Thete is one thing I cannot undetstand. Mabe it is a concept like the square route of -1.
People are talking about the benefits of super long trains. OK, you need fewer people to run them...
You have fewer trains on the road.
But would you not have:
1. Assembly and break up of these monsters. Many terminals cannot take them as is. Are there not costs involved?
Ideally, the trains are blocked, i.e., large blocks of cars, and single car switching is not normally needed except, possibly, where a block is set out.
2. Due to the mass of such monsters, would it be best to keep them moving, even at a creep. AC traction helps here. Braking issues?
It's almost always better to move slowly than to stop, with a large train. This avoids conflict with laws determining how long a crossing may be blocked by standing equipment, inhibits vandalism such as closed angle cocks or tagging, inhibits dangerous crawling underneath the train by the public, and can reduce the possibilities for delay in getting started again.
On long trains, releasing the air brakes at low speed is normally not recommended, as it often results in an uncontrollable run-out of slack, with possible negative outcome. If a long train is to kill time instead of stopping and waiting for a known delay, the recommended method is to reduce speed early using dynamic braking, and maintain reduced speed using dynamic braking and/or throttle modulation.
3. Because of 2, would you not need longer sections of 2 Main Tracks, Double Track, or very long sidings?
That would be nice. It's not always available, and this is one of those capital projects that typically takes time to budget and construct. It's not good to need it first and then try to build it. The best plan to look ahead and build for future forecasted need.
4. MP started to put wye switches on droids, equlateral switches, so the tracks of the siding was of the same quality of the main. A consideration today?
High speed turnouts are best when building or rebuilding a siding alongside a main track. Equilateral turnouts (usually 60 MPH) require the single main track to approach at the center line of the two main tracks. For turnouts allowing speeds in excess of 25 MPH, very good maintenance is needed. Some railroads will faithfully do very good maintenance, and others will do the minimum and increase the risk. The value of high speed turnouts is also dependent upon how many trains pass over them in a day. When many trains meet or pass, the benefit from high speed turnouts increases.
All delays, regardless of cause, affect opposing and following train movements.
5. Manure Happens. How many hours does it take to say, repair a damaged coupler? Should thete be more human eyes onboard? 2ML or DT could prevent a train from shtting down the railroad.
Depends where it is located.
If the train stops in rough country, it's going to take a lot more time than if there is a highway next to the track.
After an undesired emergency brake application, the entire train must be inspected to find out the cause, and ascertain that everything is still on the rails. Minimum of 30 minutes per mile of train. Hopefully it is as simple as one air hose separation. It could be multiple air hose separations, multiple broken knuckles or couplers, or a failed brake pipe. Then there can be other problems like brake rigging failure. And there's always the possibility of an overheated bearing or other wheel/axle defect.
A broken knuckle near the locomotive can be replaced by a competent Engineer and Conductor in about 15 minutes, but the delay to the train is almost always a minimum of 30 minutes on a short local and an hour or more on a full size train. If the coupler failure is far back in the train, it can take a very long time. A broken coupler (drawbar) cannot be fixed by the train crew. Either a wheel truck must come out and a Car Department crew replace the drawbar on the main track, or the train crew must set out the defective car for repair. If the broken coupler is on the "wrong" end of the car, then the car must be chained to the drawbar ahead of it, and moved to a track where it can be set out. Any time a crew has to secure the rear portion of the train to leave it standing on the main track while they take a defective car to a track where it can be set out (often miles away) and then return to the train, release all the hand brakes used to secure the rear portion, make an air test, and then proceed, it will take more then an hour at the minimum, and traffic in both directions will be jamming up on single track. It could easily result in two hours or more of delay to the train which had to set out the defective car. The longer the train, the more time it will take. Often, securing and releasing the detached portion of the train takes longer than setting out the car.
And remember -- first, it takes time to make a walking inspection of the train and find all defects.
The maximum effective distance for visual inspection from the locomotive as the train rounds curves is about one-half mile, and one employee on each side is all that is needed.
And, to address the last part of the question, multiple main tracks are not even a consideration. If they already exist, well, yes, it's your lucky day and there can be some trains still moving if one train is disabled by a defect. But building multiple main track to reduce delay if a train is disabled is not done. Multiple tracks are just something that could, by coincidence, be available, and, can be used to "single track" around a disabled train, still resulting in delay, though not as severely.
6. A case of penny wise; pound/dollar foolish?
It's complicated.
BTW, the square root of -1 is the imaginary number.