Found this on YouTube, don’t know how to post a video on, anyway put this in YouTube…
The longest union pacific train. 1/10/10
fixed that for ya
glen958:
http://www.youtube.com/watch?v=jdIzRFOaTCYfixed that for ya
Topman… Thank you…
for future reference if wanting to post a video there is a button above where you type your post called video press that and it does this> [ video ] [ /video ] (without the spaces) then you add
youtube.com/watch?v=jdIzRFOaTCY in between
That was ■■■■■■■ awsome wished i’d seen that for real must take some stopping.
mb14:
That was [zb] awsome wished i’d seen that for real must take some stopping.
The length of the train wouldnt really make any diffrence to the stopping distance as every carraige has its own brakes, under braking they all act as individual units, if you imagine a few trucks following each other all the drivers brake at exactly the same time all the trucks stop in the same distance as a single truck, would be exacltly the same distance if they were all joined togeather with the braking system joined up.
Same principel for a road train, no matter how many trailers the braking distance is the same as a single truck+trailer, providing all the brakes are working efficiently, also in practice there will be a small delay for the time taken for the air to get from one end of the train to the other
3.5 miles long!
Imagine how long it takes to do your defect check in the morning
More train fun…
I lost count at 160 something, missus bumping her gums about Britains Got Talent distracted me.
I’d hate to be stuck at a level crossing waiting for that bugger to get past!
AHT:
mb14:
That was [zb] awsome wished i’d seen that for real must take some stopping.The length of the train wouldnt really make any diffrence to the stopping distance as every carraige has its own brakes, under braking they all act as individual units, if you imagine a few trucks following each other all the drivers brake at exactly the same time all the trucks stop in the same distance as a single truck, would be exacltly the same distance if they were all joined togeather with the braking system joined up.
Same principel for a road train, no matter how many trailers the braking distance is the same as a single truck+trailer, providing all the brakes are working efficiently, also in practice there will be a small delay for the time taken for the air to get from one end of the train to the other
Correct upto a point AHT, without sounding like a pedantic ■■■, that would have taken about 2 miles to stop at 60mph. The heavier and longer they get, the bigger the stopping distance is. That particular container train was about 15’000 tons, each locomotive was 4400HP, total HP was 39’600. Each of the 9 locomotives was remotely controlled by one guy in the front one.
Ive more than a passing interest in American railway opperations. They really know how to do things over there, not ■■■■ about with it like we do in the UK. 
Just doing a quick calculation, compressed air can travel through pipes at around 30m/s before turbulant air flow starts to occur (causing large pressure loss) so based on the train being 3.5 miles long (5600 meters) it would take 186seconds ~3 minuites for air to get from one end of the train to the other assuming train brakes are air opperated 
I think there must be some sort of electrical repeaters in there somewere, but that alone could account for a huge amount of extra braking distance
I suppose it’s safer to couple what was effectively three trains together than to run them seperately. Journeys are a tad longer over there.
AHT:
Just doing a quick calculation, compressed air can travel through pipes at around 30m/s before turbulant air flow starts to occur (causing large pressure loss) so based on the train being 3.5 miles long (5600 meters) it would take 186seconds ~3 minuites for air to get from one end of the train to the other assuming train brakes are air opperated
I think there must be some sort of electrical repeaters in there somewere, but that alone could account for a huge amount of extra braking distance
That issue does cause a problem. The train in the vid has what they call DPU’s (distributed power units), in other words, remotely controlled locomotives at strategic places within the consist, this is done becuase if they put all of those 39’000 horses on the front, it would either pull the train in two or pull it all off on the first curve. That air pressure issue maybe got around by the brake force coming from the locomotives alone. These locomotives have very powerfull dynamic brakes whereas the traction motors on the axles are turned into electric generators whilst in dynamic brake mode, the current produced is fed into resistances and so the whole train can be slowed to a crawl using dynamics, they then use air brakes at low speed to finally bring it to a stop. This is why a freight train may have that many locomotives, not only to allow it to move but also to stop.
I was told that in mountainous regions in America, you wont stop a 12’000 ton freight from running away with air alone as for one, the air tread brakes will burn up and you’l also run out of air before the compressors can replenish the tanks! They’l use alot of dynamic brakes to control these big freights down a mountain! You’l offten see them use 9 or more engines for that very reason.
AHT:
Just doing a quick calculation, compressed air can travel through pipes at around 30m/s before turbulant air flow starts to occur (causing large pressure loss) so based on the train being 3.5 miles long (5600 meters) it would take 186seconds ~3 minuites for air to get from one end of the train to the other assuming train brakes are air opperated
I think there must be some sort of electrical repeaters in there somewere, but that alone could account for a huge amount of extra braking distance
On modern brakes, the air is built up, but the actual valves to activate the brakes are done by electric signals, so pretty much instant, the pressure should already be there waiting to be called upon.
I had forgotten how used to seeing things like this seem normal to me, thats a normal container train, usually 2 -3 miles long.
A common sight this side of the pond.
waynedl:
AHT:
Just doing a quick calculation, compressed air can travel through pipes at around 30m/s before turbulant air flow starts to occur (causing large pressure loss) so based on the train being 3.5 miles long (5600 meters) it would take 186seconds ~3 minuites for air to get from one end of the train to the other assuming train brakes are air opperated
I think there must be some sort of electrical repeaters in there somewere, but that alone could account for a huge amount of extra braking distanceOn modern brakes, the air is built up, but the actual valves to activate the brakes are done by electric signals, so pretty much instant, the pressure should already be there waiting to be called upon.
Not fitted on those freight wagons though wayne.
They use whats known in the trade as a single line “continuous brake” system. The continuous brake pipe through the whole train (by way of palm couplings) charges individual reserviours on each wagon. When the driver / engineer demands a brake application, the pressure in that continuous pipe is reduced. This pressure differance between the pipe and those reserviours by way of a brake distributor valve will allow the reserviours to release their pressure into the brake actuators and apply the brakes. In other words, if all the air is expelled from the main brake pipe, the brakes will be applied in full. When the brakes are released, this charges the pipe and re-charges the reserviours on the wagons. They have a term they use which is “dumping the train” Thats when an emergency brake application is made and all the air is exhausted from the main brake pipe and all the brakes come on ‘full’. Once implicated it cant be stopped until the train comes to a stand and the main brake pipe throughout the train is ‘charged’ again by the compressors.
Its a good fail safe system should a brake pipe burst or become disconnected between a wagon. The same system is also used in the UK.
You could mention the average speed of such trains here is about 30 mph, not like the speeds of trains over there, even the average passenger (so called express) trains only run at 55 mph.
We now have a high speed link from Washington DC, through NYC to Boston called ‘Acela’ that still only averages 100 mph … and it is a European design and construction.
Pat Hasler:
You could mention te average speed of such trains here is about 30 mph, not like the speeds of trains over there, even the average passenger (so called express) trains only run at 55 mph.
We now have a high speed link from Washington DC, through NYC to Boston called ‘Acela’ that still only averages 100 mph … and it is a European design and construction.
Sometimes I spose but those “stack trains” on the Trans-con will run at 70 mph for many miles across Nabraska and such.
The Norfolk Southern’s “road-railer” dosen’t hang around either- youtube.com/watch?v=xiTbaM0b … plpp_video
53 foot trailers ‘bookin it’. 