English Subtitles for how trains change tracks



Subtitles / Closed Captions - English

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yeah switches and crossings play an essential role in connecting the rail network we use them to light rains on track to another and to enable lines to cross paths it's simply that the junction reason he lined multi rooted rail network its network rail we owned over 20,000 switch in crossing units they come in

many different shapes and sizes and all are made to measure in a specific location to understand how switches and crossings work we first got to look at the rail interaction train wheels move along the rails guided only by the pound . sized area wheel that sits on the railhead the wheel rim flange doesn't normally touch the rail latches are only a last resort to prevent the wheels be coming to rail

switch can guide a wheel in one of two directions a crossing creates a gap in the rail for the flange to pass through this is a switch also known as a point it's the moving parts of the switch and crossing layouts and it's made up of two long blades which can move across the guide the Train one way or another this is the switch rail and this is called the tow

this is called the stock rail it's a non-moving part of the switch the two switch blades are fixed to each other by a stretcher bar to ensure that when one is against its stock rail the other is fully clear and will provide room for the wheel flange to pass through cleanly this is a crossing

it's the non-moving parts of the switch and crossing layout that allows a train to pass in either direction once the switch has been set this is nose of the crossing either side of the crossing area lincoln check rails are provided to assist the guidance of the wheel sets through the crossing crossings can be either fabricated made up of two machined rails join together or they can be cast as a single unit modern crossings an outcast from

manganese steel which is an advanced alloy that gets harder with use this is an important property as the nose of the crossing can take high impact loads as train wheels pass through my name is alex wants and I'm a graduate engineer work the network around i'm here today to teach you about switches and crossings the most simple form of S&C is the turnout

this is a left-hand turn as you can see it diverges from the main routes the leftward direction this is how it works in normal mode the left-hand wheel rolls along the stretch round and those funds may clearance for the right wheel to continue on the stock row the inside surface of the right flange is caps on course by the check out this restrains the wheelset and ensure this is directed along the

correct route meanwhile the left wheel transfers contact between the different parts of the crossing that's where there's a high impact load in the reverse the right wheel rolls over the switch rail and follows its geometry the inside surface of the left land is guided by the check

forcing it to follow the stock ground on the new route and the right-hand wheel makes a crossing again impacting a load on the crossing knows there are many different types of switch and crossing on the network they include turnouts diamonds crossovers and slip diamonds the type we use is determined by a number of factors including the number

of lines involved frequency of use and running line speed trains traveling at high speeds along switches and crossings at low speeds such as in stations trains can make tight turns train movements across the network assets and controlled by signalers who use switches to set routes for trains switches can be propelled by various devices

one of the simplest forms is the ground frame set up a series of rods and cams attached to leave as in signal boxes these are now largely being replaced by remotely operated hydraulic electromechanical devices seen by rail sides all across the country this is HW 2,000 points machine this is electromechanical what we have here is the drive motor to chat with

motor has done its job over here we have an interlocking and detection system detection tells us when the points are completed their travel and what locking holds the points in this state so they cannot be physically moved so when a train runs over the top it remains in position facing . locks are one of the most important safety features on the SNC layout

they ensure that the points cannot be moved to been set this is important because it a lot of switches could cause adorama as engineers we face an ongoing challenge to maintain and improve our switch and crossing assets trains can create large impact and lateral forces as they change course and these forces can cause we're in defamation switches and crossings therefore have a limited life span before we need to replace them less than

five percent of track miles are made up of switches and crossings but over seventeen percent of our maintenance budget is spent on them will continue to research and develop new inspection techniques and material usage to increase their performance it's all about creating a network that safe reliable and efficient it's what we do



Video Description

rails changing tracks, rail track joints

Kindly note that this video is copied from Network Rail facebook page... and i put this for learning purposes only.... nothing related to advertisement.
Original link is below :
https://www.youtube.com/watch?v=ZuR5QTlfOzk&list=PL6EF5E8751546E017&index=12