D8142: Louder than Bombs!
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- Опубліковано 15 вер 2024
- As Morrisey once said....
The view (and row) from the cab of Class 20 D8142 as she works a fitted freight at the Llangollen Railway Spring Diesel Gala on Sunday 13th April 2008. These workings allow passengers to ride in the guards vans at either end of the freight. The climb through Berwyn tunnel is clearly being enjoyed by all on the veranda (and in the cab!)
Sadly the loco left the railway on December 8th 2008 after 14 years residence.
www.llangollen-diesels.co.uk
Wonderful little engines and a very sturdy design... plus superb noise..
Cheers for the comments. You're both basically correct. The diverts put resistance across the traction motors to stop them generating back emf, i.e. as they spin faster they will act like a generator themselves and work against the field you apply to turn the motor. It's a similar principal to gear changes, but done entirely differently for an eletrical transmission.
HELLFIRE !!!! You must have a good knowledge of locos to notice the field divert . Nice one !!!
Excellant sound, felt like i was vertually on the footplate you've got a quality camera with excellant mic there pal.
Makes for an exciting climb and descent!
great cab view
Great sound.
Cheers! You're feet away from the exhaust port on a 20, so there's always plenty of thrash. Still day and slow speed meant no wind noise on the mic as well. Just a shame we can't repeat this at Llan any more :
field divert is basically a resistance in paralel to the field windings of the traction motors, this has the effect of allowing motor to spin faster for a given power, something to do with the motor generating current that resists the current being fed into it...or something!
We get this with D8001 going up the EVR's 1 in 27 incline!
Field diverters=Electrical gear transition? Series to parallel? Wonderful video. Keep restoring 'em!
There was certainly a Chopper on the A55 last Saturday morning....
That's me shouting in the tunnel!
Throbtastic!! :)
Yes of course, when the divert is switched on the resistances r connected by means of huge big switch things that u mention.
I dont think british locos switch between series to series parallel and all of that stuff but I am not sure.
I know in old american locos u have a transision control to switch between series and series paralell which will also adjust total resistance of traction motors which will effect engine rpm.
We need an operators manual! there r some on the web for USA loco's!!
No.
Instead of fixed magnets the traction motors use electro magnets aswell as the windings on the armature/s.
The electro magnets have a resistor connected between the + and - , this resistor is connected to divert field when the balancing voltage reaches a certain level, this has effect of being able to run motor faster, even electric locos use field diverts.
The engine slows as there is more load on the generator, like when u turn lights on in car, roughly!
track is very close to edge!
The Dee Valley, Llangollen, North Wales
But something makes transition, we have contactors or power relays in the electrical cabinet that drop the resistors as traction motor speed is gained. Something switched over at 0:44.
Choptastic!!
LoL, they don't call 'em Choppers for nowt!
Didnt these used to work in pairs through Prestatyn in the early 90s ???
Nice bellow - LoL!
Is thew driver just banging the power handle to maximum and leaving it there?
CSX predecessor Chessie System used glorified reostats in their locos to limit current per engine/gen RPM's, could this be what you mean?
Hmm - If I were blind, I think that were a helicopter on wheels =P