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Offline fred freshney  
#1 Posted : 26 November 2009 14:52:46(UTC)
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fred freshney


Joined: 26/11/2009(UTC)
Posts: 2
Location: ,
help needed i can not be the only person whoes couplings lock of centre on curved track and dont straighten back on straight track causing derailments
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Offline RayF  
#2 Posted : 26 November 2009 15:08:12(UTC)
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RayF

Gibraltar   
Joined: 14/03/2005(UTC)
Posts: 15,870
Location: Gibraltar, Europe
Sorry Fred, never happened to me.

Do you run very long or heavy trains? I think this might happen with close coupler mounts if the train is very heavy. The coupler extends in the curves, and then the spring is not strtong enough to pull it back on the straight.
Ray
Mostly Marklin.Selection of different eras and European railways
Small C track layout, control by MS2, 100+ trains but run 4-5 at a time.
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Offline jonquinn  
#3 Posted : 26 November 2009 15:35:38(UTC)
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jonquinn


Joined: 15/02/2004(UTC)
Posts: 1,591
Location: Pennsylvania
if they are the older stamped metal couplers, there could be one bent and binding on the frame too, or on the pivot point. you also have the tensioning spring mounted under the frame on the old stle freight cars - that could be missing.
this would apply to the older style couplers, not so much the new close coupler style - what vintage are the problem cars?

marklins couplers are pretty failsafe otherwise.
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Offline river6109  
#4 Posted : 26 November 2009 16:51:46(UTC)
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river6109

Australia   
Joined: 22/01/2009(UTC)
Posts: 14,873
Location: On 1965 Märklin Boulevard just around from Roco Square
What I've found, as Ray mentioned it, in my case the iron ore carriages (newer version) loaded have the tendency not to return to its straight or neutral position.
One of the reasons is, the whole coupling is plastic and moving sideways on a metal platform.
This friction can be so great, that the coupling refuses to return to its centre position.
One trick is just give it a drop of oil and move the coupling forwards and backwards several times until you feel the whole springloaded coupling is going back automatically.
My long loaded freight trains have the old version of the iron ore carriages (4624)in the front of the loco(s) and the the newer ones in the back of it.
there is also another reason behind this method. The metal coupling under load do not uncouple whereas the newer plastic ones do uncouple sometimes under load. I've found the latest Roco relexcoupling to be the best, as each coupling hooks into each other also the coupling hookarm that fits into the shaft seems to be of a stiffer material as a Märklin one.
Buffers sometimes can be the reason aswell.

regards.,
John


regards.,
John
https://www.youtube.com/river6109
https://www.youtube.com/6109river
5 years in Destruction mode
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Offline charles Sharpe  
#5 Posted : 26 November 2009 23:16:29(UTC)
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charles Sharpe


Joined: 21/09/2006(UTC)
Posts: 1,432
Location: NORFOLK UK
I have had is problem as well on a 460 whether it be long or short. I got over the problem by putting ROCO couplings on the 460 and on the first wagon/coach and know it will run on R1 curves.
CHARLES SHARPE
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Offline mike c  
#6 Posted : 27 November 2009 03:39:08(UTC)
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mike c

Canada   
Joined: 28/11/2007(UTC)
Posts: 8,220
Location: Montreal, QC
Do you mean Re 460(SBB) as opposed to the Italian Steamer?
Most likely, the problem here is with the Roco coach. If you were using the Maerklin close coupler (7203), it can get stuck beneath the buffers in extreme curves. Using the Roco Universal Close Coupler will reduce this occurrence.

In many cases with other brands' cars & coaches, the buffers may interfere with the Maerklin close couplings. In such cases, swapping the couplings for either Roco or Fleischmann couplers may help.

If using Maerklin 7203, you can also try equipping every other coach with normal NEM couplers. It will give you more space but still closer than no close couplers at all.

On some models, the bogie forces the coupling shaft to move in the direction of the curve. In extreme curves, this may actually force the shaft to far, creating a problem when pressure is exerted to return to straight or to move in the other direction (S-curve, etc).

Check the shaft and the guide to ensure that the shaft moves smoothly along the entire length.

Regards

Mike C

Regards.

Mike C
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Offline gachar001  
#7 Posted : 27 November 2009 17:31:29(UTC)
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gachar001

India   
Joined: 29/04/2008(UTC)
Posts: 1,391
Location: Chennai
I had the same problem with my Amtrak car set. As john mentioned, a drop of oil solved the problem.
Gautham
Atlanta, GA USA
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Offline charles Sharpe  
#8 Posted : 29 November 2009 19:07:59(UTC)
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charles Sharpe


Joined: 21/09/2006(UTC)
Posts: 1,432
Location: NORFOLK UK
Hello Mike.

Yes it is the 460 SBB.

Charles
Quote:
[size=1" face="Verdana" id="quote]quote:Originally posted by mike c
<br />Do you mean Re 460(SBB) as opposed to the Italian Steamer?
Most likely, the problem here is with the Roco coach. If you were using the Maerklin close coupler (7203), it can get stuck beneath the buffers in extreme curves. Using the Roco Universal Close Coupler will reduce this occurrence.

In many cases with other brands' cars & coaches, the buffers may interfere with the Maerklin close couplings. In such cases, swapping the couplings for either Roco or Fleischmann couplers may help.

If using Maerklin 7203, you can also try equipping every other coach with normal NEM couplers. It will give you more space but still closer than no close couplers at all.

On some models, the bogie forces the coupling shaft to move in the direction of the curve. In extreme curves, this may actually force the shaft to far, creating a problem when pressure is exerted to return to straight or to move in the other direction (S-curve, etc).

Check the shaft and the guide to ensure that the shaft moves smoothly along the entire length.

Regards

Mike C

Regards.

Mike C
CHARLES SHARPE
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