There's one that could out do all those mentioned above.
In 1976 a class 47 (minus its bogies) was hired to West Thurrock Power Station for use as a static generator.
EDIT : it was D1748 / 47155 for anyone interested.
It wasn't used as a generator as such - but as an exciter.
Relative to a power station generator a locomotives generator does nothing, pointless having it there, thats like trying to heat your house with an AA battery.
What happened at West Thurrock was one of the power station's generator's field exciter failed, and it happened that the main generator characteristics of a 47 matched that of the failed exciter. 47155 did of course generate electricity in this role, but not to be used as power to heat or light anything, but to allow the power station generator to do so.
This was not the first time a BR diesel loco found such a function, some time well before this a 45 (at least I think it was a 45 it could have been a 46) performed a similar exciter role at one of the smaller Trent area power station, IIRC it was Willington, but it might have been Castle Donnington, in 1960s.
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Nick
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Saw the following videos yesterday so thought I'd share them and see if anyone else has seen or taken any videos, photographs, or actually witnessed other similar situations where locomotives perform tasks which you wouldn't associate with them:
[1] using a locomotive to haul rails - but not on wagons
- when they did LWR recovery off the Woodhead route west of Woodhead for re-use elsewhere, a single 37 on the by then part demolished route attached by chains to drag rails further westwards as demolition continued. In effect, the real last ever train over some section was this "train" removing rails behind itself.
[2] using a bunch of locos as anchors during recovery
- somewhere up a Welsh valley (Ebbw Vale line ???) a 37 derailed and rolled down a bank. It was recovered by literally pulling it up slope again by chains, but they had about half a dozen various locos positioned as stationary anchors to restrain the chains and track, and also fixed by chains. There are some pics of this in a contemporary Modern Railways - its not mentioned in the caption but you can easily see one of the anchor locos is actually D1200.
[3] MLVs to haul Mk.1 loco hauled passenger stock must count here
- see Six Bells Junction SEG "Vulcan Vantrain" ; I was the SEG train manager for this.
[4] and this - permit me to drift outside the UK into France -
http://en.wikipedia.org/wiki/Montech_water_slope
specifically
http://en.wikipedia.org/wiki/File:France_-_Montech_-_Automotrices_de_la_pente_d'eau_-_2005-01-15.JPG
http://en.wikipedia.org/wiki/File:Montech_fermeture.jpg
Those things are not locos even though thats what it says, but are dmu motor coaches from a (failed ??) export order adapted for this job. They don't exactly run on rails though, but are just about trains, and act as locos, one each side of the boat. Its in operation today. (This is not the same as the Panama canal locos - there they don't actually haul the ship through the locks, but guide it.)
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Nick