Sweden, but the station I’ve no idea.
Sweden, but the station I’ve no idea.
I'll take a guess at Uppsala, as the trains to Narvik go through there, Stockholm central has a bigger canopy, lots of the smaller stations won't have a big canopy, and Uppsala one of the more likely places for someone from the UK to visit.
Well done, chocolate frog on its way.
To be honest I think this can be quite a good game (if it gets harder than that), if people agree perhaps it can earn its place in the Quizzes & Games section ?
Common practice in many Continental countries - I think it's just so there is a spare in case it goes wrong, although raising the rear one reduces the reflection of sparks into the driver's eyes. Some multi-voltage locos have different pantographs for different voltages, but I don't think this is one of them.Why does the loco have two pantographs?
For completeness I should point out that Sweden has 15kV AC electrification, so that reason doesn't apply in this particular case.Two pantographs are also quite useful when large amounts of current have to be drawn from the catenary. This is - or was, because with today's power electronics, it's less of an issue - particularly the case with 1500 or 3000 V D.C. electrification. Drawing 5000 amperes from one panto-catenary contact point is not a problem when the train is moving, but when starting, the heat generated at that point does not dissipate quickly enough and can easily melt the wires. So you will often see trains hauled by D.C. locs start with their two pantos up, and then one drop as soon as the train has gained enough speed. Not only freight trains, but also large passenger ones, which can easily draw up to 800 amps for just for hotel power.
For completeness I should point out that Sweden has 15kV AC electrification, so that reason doesn't apply in this particular case.
It does, but there's a big difference between 240 amps on the AC system and the 5000 amps quoted above for DC locos. Especially as, if the resistance of the pan-wire interface is the same, the amount of heat produced depends on the square of the current............. but it still reduces the current draw on each pantograph by 50%, (>240 amps at full load given the loco's 3.6mW output).
For completeness I should point out that Sweden has 15kV AC electrification, so that reason doesn't apply in this particular case.
Sweden, but the station I’ve no idea.
Correct, I'm not sure how anyone can tell the station, I was being mischievous, but it was a sleeper and was heading due north.
I'll take a guess at Uppsala, as the trains to Narvik go through there, Stockholm central has a bigger canopy, lots of the smaller stations won't have a big canopy, and Uppsala one of the more likely places for someone from the UK to visit.
To be honest I think this can be quite a good game (if it gets harder than that), if people agree perhaps it can earn its place in the Quizzes & Games section ?
Why does the loco have two pantographs?
Common practice in many Continental countries - I think it's just so there is a spare in case it goes wrong, although raising the rear one reduces the reflection of sparks into the driver's eyes. Some multi-voltage locos have different pantographs for different voltages, but I don't think this is one of them.
The first pantograph can also be used to scrape ice off the overhead contact wire, with the second used to actually draw current. This is certainly handy in northern countries.
And you are right, this is a single-voltage locomotive.
For completeness I should point out that Sweden has 15kV AC electrification, so that reason doesn't apply in this particular case.
LKAB has always had mean machines !It wasn't too hard to identify the station…
Correct, track 2 to be specific.
On the biggest Swedish rail forum there is a weekly quiz with four images from an unknown location, run by the same person for over ten years now. Usually three images from Sweden and one from another part of the world. Anyone know where this image is taken e.g.? https://www.postvagnen.com/sjk-forum/showthread.php/11055-En-utländsk-tisdagsbild Quite fun actually.
There are number of reasons. Redundancy is one, having a 2nd one is great if the first should fail. And for aerodynamic reasons it is better to have it in the rear end as it avoids the turbulence around the front at higher speeds. And if there is thick rime ice on the wire contact is reduced so using both improves the contact a lot.
Not with this loco, but the Dm3s used both pantographs.
Not with this loco, but the Dm3s used both pantographs.
LKAB has always had mean machines !
Probably because they are made of two independant halves, each panto supplying the one just below it.
............ but it still reduces the current draw on each pantograph by 50%, (>240 amps at full load given the loco's 3.6mW output).
I'm wondering whether the quoted power in mW should be in MW!!!
And the middle part supplied by?
Just spotted this. Suitably nostalgic for the end of the EC HST era.Anyone know where this image is taken e.g.? https://www.postvagnen.com/sjk-forum/showthread.php/11055-En-utländsk-tisdagsbild
Was almost sure tgat somrone would come with that question. Frankly, I have no idea. But Wikipedia tells that those locos indeed were originally double, with the third, cabless element added later.
Correct, my bad.
Once a physics teacher, always a physics teacher...