I have just moved near to Victoria Station in London and have no real problem with the noise from the trains, but I am curious why some train wheels screech and some don't?
2006-10-07 04:52:14 · 22 answers · asked by Neil 1 in Cars & Transportation ➔ Rail
No one here has mentioned that a train has no equivalent to a deferential on a car. Trains have solid axles meaning that when it travels round a curve one of the wheels has to slip a bit, it is this slipping combined with the weight of the train that produces the noise
2006-10-08 06:48:00 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Well why some sceech and why some don't, i'm not intirely sure but I've been to that station once before... I don't live in England but I've seen it and from what I remember there were trains that did and didn't screech as they came in... I think the speed, the way the track is layed out and metel on metel have something to do with it. Some trains may start slowing down before others and therefore when the train comes to a complete stop there is less or no noise coming from the wheels. It may also depend on the break system.. the new the breaks the better they'll work... so I think that the reason some do and some don't is because of the breaks and how soon the train comes to a stop... if it starts slowing down way before then there probably wont be as much of a screeching noise when it stops... but really this is all based on logic and from seeing trains stops and I remember helping my dad fix the breaks on our old van.. whenever we came to stop and he'd slow down real fast the breaks would screech loudly but when he would start to slow down way before there would be no or very little screeching... so yea this is all kinda a guess.. so I hope this helps in some way.. just not sure if it's right
2006-10-07 05:08:00 · answer #2 · answered by David 2 · 0⤊ 0⤋
As bostonian says it is caused by the flanges on the train wheels touching the rails on sharp bends. Normally the conical shape of the tyre profile keeps the wheels centred on the rails and the flanges should not touch. On some bends an arrangement is made to grease the rails to reduce tyre wear. The ones which screech probably have worn tyres due for re turning
2006-10-07 05:05:05 · answer #3 · answered by David P 4 · 0⤊ 0⤋
The reason train wheels screech is down to vibration, have you ever heard your car brakes( if you own one), the metal vibrates
at a very high rate under load this frequency translates to noise,
and thus the result is an annoying screech.
Hope this helps.
2006-10-08 09:22:43 · answer #4 · answered by webbfink1 1 · 0⤊ 0⤋
One factor in the amount of squeal is the distance between the wheels on the bogies. The Pacers used in the North of England, South Wales and the Bristol area are worst, as they only have 4 wheels per coach (instead of 8 on most trains)
2006-10-07 19:06:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
usually on curves, but if the track is out of alignment, and forces the wheels sideways off of the course that they were going in, it will squeal. This happens with the flange on the wheel, and I believe it happens with the part of the wheel that makes contact with the top of the rail when it is forced sideways.
Sometimes there is something at switches that are made to keep the wheels from crawling over the frog and derailing that the field side of the wheel makes contact with and will squeal.
2006-10-07 18:26:01 · answer #6 · answered by Anonymous · 0⤊ 0⤋
Simply enough, they screech in curves and on straight track because the flange on the inside of the wheel contacts the "ball" of the rail and due to the degree of the curve being tight and the gage of the rail being narrower in some places than others.
2006-10-07 17:31:24 · answer #7 · answered by mich 1 · 1⤊ 0⤋
definite, that's on the subject remember of the differentiation in velocity between the interior wheel and out wheel in a turn. the floor velocity of the outer wheel is bigger than that of the interior wheel. reason is the exterior track has a bigger radius and motives this is respective wheel to spin quicker. through fact the axles on trains are"stay" the two wheels linked, the interior wheel spins on the comparable RPM and honestly skids or Screeches on the track. additionally the flanges on the interior area of each and every wheel will touch the track in a turn, they shop the prepare from leaping off of the rails, this radial tension exerts intense tension on the two the wheels and rails. the version in wheel velocity and tension exerted with the aid of wheel flanges reason the screech. it is likewise very neat to observe at evening, there are in many situations sparks seen comming from the wheels.
2016-12-08 10:06:19 · answer #8 · answered by ? 4 · 0⤊ 0⤋
Im a tube driver, and I have no idea lol. I think it could possibly have something to do with the curves, and the flange on the wheel touching the sides of the rails as it goes round (flange being the horizontal bit that goes down on the edge of the wheel itself)
2006-10-07 04:59:51 · answer #9 · answered by ? 3 · 0⤊ 0⤋
The screeching is caused by the lip on the inside of the train wheel rubbing on the inside of the rails. It's most common on curved sections of track and tends to ebb and flow as the weight of the train shifts from side-to-side as it negotiates the curve.
2006-10-07 04:57:25 · answer #10 · answered by Bostonian In MO 7 · 3⤊ 1⤋