railfan458sw
On Moderation
If the DVT doesn't have traction motors and uses power from the 91 how is it moving? The 91 pushes but that means it is reversing?
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82xxx DVT how do they move?
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R
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It’s a carriage which has been designed to have a driving desk with through wiring to the locomotive. All motive power is provided by the locomotive regardless of direction of travel.
birchesgreen
Established Member
Its not a "Class 82", that was an electric locomotive now withdrawn.
The DVT is coaching stock.
One DVT has been fitted with independent means of propulsion as the Class 19 to test various technologies...
en.wikipedia.org
The DVT is coaching stock.
One DVT has been fitted with independent means of propulsion as the Class 19 to test various technologies...
British Rail Class 19 - Wikipedia
pdeaves
Established Member
It's a convenient way to make 'loco and coaches' behave like a 'multiple unit' and remove the need for shunting each time the train reverses.
norbitonflyer
Established Member
Like all modern traction, a class 91 can move as easily in one direction as the other (it even has a cab at each end, although the blunt end cab is rarely used) So yes it's pushing but it's misleading to say its reversing. The driver in the DVT is controlling the Class 91 remotely, just like any EMU with a driving trailer leading.
dk1
Veteran Member
Controlled by TDM.
43096
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Time Division Multiplexing.
dk1
Veteran Member
Time Division Multiplex. It’s how the DVT/DBSO & Loco communicate.
Western Lord
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Modern traction? Steam engines could (and did/still do) run in either direction!
dk1
Veteran Member
Easiest way I used to explain it is the Loco is the husband & the DVT is the wife. If they disagree they divorce (deconfigure) and then you continue as single (conventional).
Islineclear3_1
Established Member
Shouldn't it be the other way around? The loco being the wife controlling the DVT husband....
I'll get me coat....
dk1
Veteran Member
Most definitely lolShouldn't it be the other way around? The loco being the wife controlling the DVT husband....
I'll get me coat....
185
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Consider a DVT to be just a box with a windscreen and a (duplicate) set of controls to tell the loco at the other other end to push the train backwards.
TT-ONR-NRN
Veteran Member
Ah yes, the DVT with that genuinely terrifying new second cab!Its not a "Class 82", that was an electric locomotive now withdrawn.
The DVT is coaching stock.
One DVT has been fitted with independent means of propulsion as the Class 19 to test various technologies...
British Rail Class 19 - Wikipedia
47827
Member
Whilst I fully appreciate the reasoning behind them on the efficiency they brought it did water down the ride quality and increase lurching as pushing with that sort of acceleration and at higher speeds isn't the smoothest option. It's a good job nobody tried to get the sleepers operated with such a system in the end for exactly that reason although I'm sure it'll have come up in meetings and on suggestion lists over the years.
nlogax
Established Member
I'm anti 'form over function' but damn the externals on that rear cab look horrible.
Cherry_Picker
Established Member
There's not much of a need to put a DVT on the sleeper, they don't need to turn around half a dozen times a day.
zwk500
Veteran Member
More importantly, the portion working of the sleeper would make reforming the DVT a right pain.
Bletchleyite
Veteran Member
There is talk of using one on the Night Riviera as that doesn't portion-work - was mentioned as a possibility (but not certainty) in the article in Modern Railways about the proposed new locomotive order.
It'd not be helpful for Caledonian Sleeper.
zwk500
Veteran Member
Night riviera would make more sense as it would remove the need for the second loco to attach/detach at Reading and get rid of the propelling move on/off Long Rock at Penzance.
dk1
Veteran Member
Thanks.
Is there enough station length for an added DVT or would it be in lieu of a carriage.
Not only that, they were quite capable of being controlled remotely too!
( as an aside how many autotrain control systems were there? the GWR used physical rods but I thought one of the others used some sort of pressure based system ).
Other than being run on a shoestring I'm slightly surprised it wasn't looked at before when the mk3 DVTs went surplus - wouldn't be the first time old TDM equipment was reused/refitted, & doesn't it use the PA circuitry?
hexagon789
Veteran Member
The LNWR used mechanical linkages with rods but the LMS adopted the vacuum system from 1927 and converted existing equipment.
The French used compressed Air such as on the seven-coach double deck steam push-pull sets used on suburban workings out of St Lazare.
RCH jumpers, which are used for controlling the lighting etc.
Though in early WCML days there were issues with signal degradation, so the Mark 2F and 3 stock used on the WCML was fitted with screened cables for the push-pull working.
Gloster
Veteran Member
I think that one of the Southern’s constituents used wires running along the roof. Even though the driver was at the other end of the train, there was still the fireman on the footplate.
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