LONDON UNDERGROUND
The Underground – a part of my London
John Wilcox of Express Medicals gives a personal view on the development of the Tube network.
W
hen the fi rst London Underground line between Paddington and Farringdon was opened in 1863, no one could have imagined that 150 years later there would be such a vast network of tracks and tunnels.
It’s a place to play music and express your views, a place that goes hand- in-hand with popular culture even to this day.
It is hard to imagine London without the Tube, it has become part of the
It’s estimated that over a billion people a year catch the tube, and millions of commuters rely on it on a day to day basis to get to work.
But London Underground is more than just a transport system; it was once a place of refuge during the Second World War.
great city’s identity.
It will almost certainly be around for another 150 years to come and its legacy will only continue to grow.
opinion@railtechnologymagazine.com TELL US WHAT YOU THINK
A new evolution in bolt security N
uts and bolts are often seen as trivial hardware, however a joint with a design
fl aw, or worse, a joint that fails, can and will cause serious consequences – not only in terms of costly down-time but also in terms of worker safety.
There are two main reasons why bolts fail: spontaneous bolt loosening (rotation of the fastener) caused by vibration and dynamic loads, or slackening of the joint (no rotation of the fastener) caused by settlements and relaxation.
Solutions that are currently available on the market tend to address only one of the two challenges, offering either a locking system or an elastic system to secure the bolted connection.
Critical application design has involved trying to fi gure out which – spontaneous bolt loosening or slackening – will have the biggest effect on the joint, and choose a solution to handle that single problem.
46 | rail technology magazine Jun/Jul 13
Graham Souter, managing director of Nord-Lock for the western region, describes a new solution to avoid having to make a diffi cult compromise.
It is a diffi cult compromise to make, especially as both potentially cause application failure.
As an innovative organisation, it became Nord- Lock’s goal to design a system that eliminates customer’s insecurity when choosing a solution for loosening joints.
This system would need to be effective against dynamic load, vibrations, settlement and relaxation all together.
For total security when you cannot say with certainty whether spontaneous bolt loosening or slackening is the bigger issue – or when you know both are equal risks and could potentially cause application failure – there simply can be no compromise.
The bolting experts at the Nord-Lock Group have the answer, and we can’t wait to share it with you.
www.nord-lock.com FOR MORE INFORMATION
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