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Blog : Posts tagged with 'preventative maintenance'

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Facing points (part two)

In which we go over some railway history


More notes on the Lambrigg and/or Grayrigg train crash from a couple of weeks ago. Continued from here.

As I said in the first part, it was known for many years that junctions are a dangerous thing. Any place where a train has a choice of routes to take is a danger point, and the railways, for a hundred years or so, got around this by avoiding them as much as possible. A freight train, going into a siding, would have to run past it, stop, and back up slowly into the siding.

This is a very safe and careful thing to do, but it is very, very slow. Trains take a long time to slow down, and a long time to stop. Backing up has to be done very slowly, too, and the whole operation blocks the main line for rather a long time. If the train could run directly into the siding, things would be a lot faster.

Similarly, if one line of a pair has to be closed for engineering works, trains have to run in both directions over the remaining line. The old way of doing this was very slow indeed – the train would have to stop, reverse backwards onto the other track, then reverse again so it was going forwards. All very fiddly and slow,* and it would have been easier if there was a faster way to do things.**

So, in the 1960s and 1970s, an awful lot of the rail network got simplified and redesigned. In particular, “emergency crossovers,” like the ones involved in the Lambrigg crash, were installed every few miles on the main lines. Essentially, all they were there to do was let trains switch across to the other track if one line had to be closed for maintenance. This, though, meant greatly increasing the numbers of relatively dangerous, maintenance-heavy facing points on high-speed main lines. Cost was no longer an issue – greater automation and mechanisation of the railways meant that all points were fitted with exactly the same locking equipment, so the legally-required and previously expensive locks on facing points were now provided for free. Maintenance still mattered, though.

Note that I said “relatively dangerous”. Facing points are maintenance-heavy, purely because they are intrinsically more dangerous than trailing points. This isn’t an issue, though, so long as the maintenance gets done. And, over the years, all points started to be given the same level of maintenance – there is in many ways no longer a distinction between facing and trailing points, maintenance-wise, because as I said above they nearly all have the same fittings.

So long as the maintenance gets done. That is the key. Railways just aren’t maintained in the same way that they used to be. There’s no longer a man walking every stretch of track, every day of the year, looking out for faults, like there used to be. If facing points aren’t maintained properly, they become dangerous, and they’re likely to cause accidents, such as Lambrigg and Potters Bar. The problem is, they’re vital to being able to run the railway smoothly and flexibly. If you want to run a flexible railway, it’s going to cost you more. You have to be willing to pay the price, however you want to pay it.

* there are lots of other rules involving people waving flags and people whose job is just to be unique, but I won’t bore you with them.

** This has nothing to do with the closing of alternative routes, incidentally, which people sometimes go on about as being a Bad Thing in connection with the rail network. Alternative routes are often a lot less useful than people like to make out.

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Big Bang

In which we know why things explode


I know it’s only a few hours since the Buncefield oil storage depot exploded, but I’d like to jump in already and hazard a guess as to what the primary cause was. The immediate cause will no doubt be something like a leaky joint and an unexpected spark; but the primary cause will probably end up being reactionary maintenance policies: engineers being instructed not to replace anything until after it’s already broken.

This is entirely a guess on my part, I must say. However, most of the fuel stored burning at Buncefield is piped there from the Lindsey refinery, owned and run by Total, the same company that runs Buncefield. And, coincidentally, just the other day I was chatting to a friend of mine who works there. Total had just been fined £12,500 for a serious oil leak at Lindsey, and we started talking about how it had been caused.

“We don’t do preventative maintenance any more,” he told me. “Lindsey’s idea of maintenance is: wait until something starts leaking, then patch it up.” Which, when you don’t catch it in time, leads to nasty leaks. Some of them, like the one at Lindsey, are just pollution problems; others go up in flames. If the sort of maintenance regime used at Lindsey is standard at Buncefield too, it’s easy to guess what the cause of today’s explosion may have been.

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