Voyagers engines at stations

Discussion in 'Traction & Rolling Stock' started by MCR247, 30 Jul 2012.

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  1. MCR247

    MCR247 Established Member

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    When a voyager is at a station, during the process of the doors closing the engine revvs up? Does anyone know the reason for this?
     
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  3. swt_passenger

    swt_passenger Veteran Member

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    It is to get the engines up to speed ready for the higher electrical output needed for acceleration on departure - so this happens as the doors are closing, but it is really just a coincidence, two separate things are happening together.
     
  4. MCR247

    MCR247 Established Member

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    Ok thanks :)

    Didnt think closing the doors would require that much power!

    So is this something that the driver is in control of or does it do it automatically when the doors start to close? Also when say stood at a signal, will the train do the same thing?
     
  5. swt_passenger

    swt_passenger Veteran Member

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    I think it must be under driver control, because I've seen a 'close doors' following staff checking a train is empty at the end of journey without causing an increase from idle.

    It could be that it works the other way of course, in that applying power automatically closes the doors, if they aren't closing already - you wouldn't really be able to tell from outside the cab!
     
  6. MCR247

    MCR247 Established Member

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    Oh yeah. Thanks for the answer and help :)
     
  7. GingerbreadMan

    GingerbreadMan Member

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    When the engine management computers detects a drop in voltage across its serial buses, the alternator requires a higher rpm to help recharge the batteries. Its automatic. (like a car, electrics take a feed off the batteries and in turn the battery takes a feed from the carriage alternator).
     
  8. xc toon

    xc toon New Member

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    A voyager s engine speed only increases when the driver moves the direction selectee switch from nuetral to forward. The engine speeds up from 994 rpm to 1144 rpm
     
  9. western Champion

    western Champion Member

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    Total and complete train spotter type rubbish !

    The engine speed will stay at low idle (994 rpm) until the driver moves the master switch to direction, if the master switch is in direction with the doors enabled then the engines will stay at low idle, as soon as the doors are closed and interlock is achieved and provided the master switch is still in direction the idling speed will increase to 1144 rpm.

    On VT the instruction is to keep the master switch in neutral until interlock is achieved and the right away given.
     
    Last edited: 30 Jul 2012
  10. xc toon

    xc toon New Member

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    sorry but you are wrong, the doors can be open and so long as there is enough main air (above about 6 bar) if the driver moves the selecter switch to forward the engines will goto 1144 rpm.
     
  11. swt_passenger

    swt_passenger Veteran Member

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    All I explained was that it is not the action of closing the doors that causes the engine speed to rise.

    The way you have explained it, (i.e. the doors being fully closed allows the engine speed to rise if it has been demanded by the driver) does not mean what I said was logically incorrect.

    Causing and allowing are subtly different things.
     
  12. 387star

    387star On Moderation

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    Love the sound Voyagers make when they depart. Really sounds like they are going to get you somewhere fast
     
  13. dk1

    dk1 Established Member

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    Me too. Always sound quite meaty :smile:
     
  14. 172212

    172212 Member

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    I can hear a voyager from a mile away, they're very loud. Sometimes I can't tell whether they're stationary or departing, because of the loudness. Great engine though
     
  15. richw

    richw Established Member

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    I live about 200 metres max from the cornish main line, of all the passing trains, voyagers are the only ones I hear. Not sure if it's because they are louder, or as they are so much less frequent I haven't learnt to black them out yet.
     
  16. Arriva158

    Arriva158 Member

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    if it sounds simple, it sounds like the engines are just shunting more power to the electrics to make sure the interlocking and doors complete and to get them ready for what should be a long stint of journey!
     
  17. Hairy Bear

    Hairy Bear Member

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    Great engine ?
    They leak oil and coolant everywhere. Throw huge amounts of oil out of the breather and run so hot they rack the power back to cool off.
    I disagree.......Not one of Cummins best.
     
  18. Retorus

    Retorus Member

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    They sound good though.
     
  19. es373

    es373 Member

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    xctoon is right. I thought voyagers were diesel and not diesel electric therefore you don't need to generate a higher electrical output.
    Diesel engine is linked to a carden shaft which joins to a gearbox thus delivering tractive effort through the powered wheelsets.
     
  20. dosxuk

    dosxuk Member

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    No, they're DEMU's. Otherwise the plan to fit them with panto cars would be a waste of time.
     
  21. es373

    es373 Member

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    Didn't know of any such plan, don't really follow what goes on inside the railways much. That is of course unless it's something to do with my company.
     
  22. 172212

    172212 Member

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    They sound brilliant :D. Loudest DMU I've heard though
    --- old post above --- --- new post below ---
    If this was the case wouldn't they do something about it :|
     
  23. Nym

    Nym Established Member

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    They're also a new type of DEMU that has recently evolved out of more advanced control systems, nothing like the DEMU or DE Locomotives of yesteryear...
     
  24. sprinterguy

    sprinterguy Established Member

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    ...Arguably...

    Jumped up bus engines with ideas above their station in life, in my opinion <D (Although more accurately, aren't they derived in some way from marine practice?)
    --- old post above --- --- new post below ---
    When passengers are required to sit directly above the engines, I don't feel that this is something that should be aimed for - The quieter the better: Locos are different, they keep all the noise in one self contained unit at the end of the train, for enthusiasts delectation only :D
     
  25. ainsworth74

    ainsworth74 Forum Staff Staff Member Global Moderator

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    I thought that was the MTUs running around in HSTs?
     
  26. 172212

    172212 Member

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    Yeah, I love DMUs, so the louder the better :D. As for voyager's engines, they're not actually that loud inside, or at least I don't think so
     
  27. sprinterguy

    sprinterguy Established Member

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    That's true, but I am unsure if the Cummins engines also follow a similar lineage. Possibly not, and my "jumped up bus engine" analogy might remain more accurate ;)
    --- old post above --- --- new post below ---
    Compared to 180s, which utilise the same engine, the Voyager engine noise is intrusively loud within the passenger saloon IMO.
     
  28. 222001

    222001 Member

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    I can confirm the 'revving up' sound is caused by the driver moving the reverser into forward from neutral. You will notice that the engines rev down after a train stops in a station as the driver moves the reverser from forward into neutral. The doors have nothing at all to do with it. The doors will open and close even if the train is turned off, as long as there is juice in the batteries - as they use motors and not air to open the doors as with some other stock.
     
  29. MCR247

    MCR247 Established Member

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    VP185s are boat engines
     
  30. Nym

    Nym Established Member

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    The QSK19 was a general purpose generator engine, can be used in boats or trains, the 19F is a revision (wider V angle) specifically for rail vehicles.
     
  31. depablo

    depablo Member

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    They do suffer from oil leaks, burst pipes, loose fittings, gaskets etc. The breather problem has finally been sorted by a new design.

    Normally they do not run hot, however when a fault develops they "derate" and cut the power back. They use hydrostatic fans for cooling; low oil, faulty pumps or fan motors can cause this. Also charge air coolers becoming choked by vegetation from trackside is a major problem, they introduced health checks and the radiators should be cleaned during the night by depot staff (although this does not always happen).

    They are a six cylinder engine, laying them out horizontal led to design challenges.
     
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