Banking in the rear - possible?

 
  apw5910 Chief Commissioner

Location: Location: Location.
Been reading about rear end banking up Raglan and Tumulla, mainly prototype articles from Roundhouse and Byways. A couple of ancient articles about Tumulla in AMRM mentioned it might be possible in model form with Zero 1. This was written in the late seventies, so that was then the newest thing for independent loco control, since eclipsed by DCC of course. But I've never seen it done at any model exhibition or private layout. Has anyone got it to work? Is there a knack?

Sponsored advertisement

  yogibarnes Locomotive Fireman

Been reading about rear end banking up Raglan and Tumulla, mainly prototype articles from Roundhouse and Byways. A couple of ancient articles about Tumulla in AMRM mentioned it might be possible in model form with Zero 1. This was written in the late seventies, so that was then the newest thing for independent loco control, since eclipsed by DCC of course. But I've never seen it done at any model exhibition or private layout. Has anyone got it to work? Is there a knack?
apw5910
Yes, has been done several times on my layout - three operators individually controlling a standard goods and a 57 class leading, standard goods in the rear, 15 goods wagons both 4 wheel and bogie up a 1:40 grade.  Looks, and sounds, great!  No derailments yet.  However, all the planets must align to ensure success. I'm on DCC so locomotive control is perhaps better than most DC layouts.  Track and power pickup wheels must be in good condition because a locomotive stall on a curve can lead to a string of wagons going down.  Wagons should be near NMRA weight guidelines.  When the train is moving, the trick is to ensure the rear driver watches the couplers a few wagons ahead.  They should oscillate between tension and compression.  Once a steady speed is achieved, maintaining it is easy.  At start and stop, a countdown is used to coordinate the three operators' actions.

Good luck with it!
  duttonbay Minister for Railways

It is not an easy thing to do as yogibarnes says. You will need to ensure that the locos in use have similar, if not identical, speed curves, as if not, even a count-down as you slow to a stop will be difficult. You can adjust your throttles simultaneously but if not set the same, the locos will respond differently.  Even starting off can be difficult, as if the banking loco is slow beginning to move, and the train is on a curve, you run the risk of the wagons on the train straight-lining the curve. Likewise if you notice the couplers bunching, and slow down a bit too far.

Despite a number of attempts, I have not yet successfully completed this task, nor seen any other pair of operators do so, on the layouts I have operated on.
  Piston Train Controller

Banking in the rear is entirely possible with DCC as is done on Marcus Ammans layout.



http://https://www.youtube.com/watch?v=kzmhLp1H-n8&t=1s
  Donald Chief Commissioner

Location: Donald. Duck country.
I am not a DCC operator.  Could you consist a pair of locos, but have one on the front & one on the rear?
Or are you talking about a different driver/controller for the rear loco?
  dthead Site Admin

Location: Melbourne, Australia
you  could consist a loco, but  most likely not work and result in a specactular fail. the best way is two operators, asothers say   cmmunication is needed, and the loco at the rear will drive differently as the slack of the train dictates.

oe thing in digitrax's favor as the  duel controllers in one handset so one operator might be able to do both roles, but would take practise.

a consisted set would be ill advised even iflocos were matched.

David Head
  speedemon08 Mary

Location: I think by now you should have figured it out
If I ever attempt mid train DPU's at AMRA Victoria's club layout, which runs a Digitrax system, I usually consist locomotives a particular way so that they end up fairly evenly matched and sometimes use each side of the larger throttle I own to control both consist groups at the same time.

Sponsored advertisement

Subscribers: 8502

Display from: