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KTJ can you slam on the brakes like this ?

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Author Topic: KTJ can you slam on the brakes like this ?  (Read 162 times)
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akadaka
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« on: November 20, 2010, 12:56:22 pm »

looks like he's totally pissed!!!!!!!!


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Kiwithrottlejockey
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« Reply #1 on: November 20, 2010, 01:30:03 pm »


Slamming the brakes on violently with a train is likely to cause the wheelsets to lock up and the train to go into a slide.

This results in two things occuring....

1. The train doesn't stop in a hurry, but instead slides for a considerable distance, resulting in taking longer to stop than normal.

2. The wheels end up with big flats worn in the steel tyres and it costs around two grand per wheelset (an axle with two wheels on either end) to get rid of the flats using an underfloor wheel-lathe. Then the boss tends to go apeshit and demand to know what the fuck you thought you were doing!

However, the old trams that used to run in our streets could stop almost on a dime. Because in addition to the normal air brakes, they also had magnetic brakes which were used while descending steep gradients (such as from Wadestown or Brooklyn in Wellington), or when they really needed to stop in a huge hurry for emergency reasons. The trams had cast-iron brake-blocks between the wheelsets which braked directly on the rails. However, they didn't just rely on the weight of the tramcar itself, but were magnetised by a huge electromagnet on the housing just above the brake-block. The result was that the brake-block turned into an extremely powerful magnet and was attracted to the steel rail beneath it with a massive amount of magnetic force, resulting in friction many, many times greater than the brake-blocks acting on the wheels (with air pressure) could apply. If a tram motorman suddenly had to contend with a pedestrian or a motor vehicle in front of him, he could literally hit the magnetic brake emergency-stop button and the tram would stop dead, usually throwing all the onboard passengers to the floor in the process. Trains don't have braking like that and it wouldn't work with trains.
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Im2Sexy4MyPants
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« Reply #2 on: November 20, 2010, 04:36:15 pm »

Do trains have sand that drops on the tracks under braking i think ive heard of it?
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Kiwithrottlejockey
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« Reply #3 on: November 20, 2010, 08:17:01 pm »


Yep, we use sand for grip both for traction and for braking.

However, as a rule, electric locomotives and electric-multiple-unit trains don't use sand, because it tends to partially insulate the wheels from the rails and as the electric current return is via the rails, it causes arching which can burn chunks out of wheels and rails.

Sometimes when there is a southerly in Wellington, the EMUs don't stop at Ngauranga, because with all the salt spray on the rails, if they do manage to stop, they cannot get going again. Even with minimum power, the wheels just spin without the train going anywhere.
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