Discuss model railway topics and news that do not fit into other sections.
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Postby monty2420 » Tue Aug 21, 2018 4:51 pm

Hi All
I have a Class 20 Railfreight livery no 20118
It jumps off on the points or crossovers any one help?
in there something i can do to improve this all
points etc are clear of stray ballast/spiders etc.
Monty :? :?

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Joined: Tue Aug 14, 2007 2:19 pm

Re: Class20.

Postby Bigmet » Tue Aug 21, 2018 5:10 pm

It may prove helpful to know if this is the Lima / Hornby model (same mechanism) or the Bachmann. (Or possibly even the H-D/Wrenn.) Or even N gauge...

To know what needs to be fixed a lot more information is required.

Does the derailing happen on every single point or crossing in both directions and with either end of the loco leading?
If not, can you narrow it down to the combinations that are trouble?
Is the layout trouble free with all other locos and stock?
What is the track system from which the points and crossings come?
Do both bogies swing freely?
Are the wheelsets all in gauge? If you don't have a back to back gauge compare to wheelsets on a reliable loco or piece of stock as a first estimate.

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Joined: Wed Sep 10, 2014 9:44 am

Re: Class20.

Postby monty2420 » Tue Aug 21, 2018 8:21 pm

Hi Bigmet.
All Hornby track and the Class 20 approx age 2008
all other locos and rolling stock behaving as is. one
fly in the ointment is my 2012 LMS princess class 462
front bogie will not stay on the tracks.
Tracks are checked for debris each time its used.
All good voltage supply to all cleaned wheels.

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Location: Antipodes

Re: Class20.

Postby GWR_fan » Wed Aug 22, 2018 12:00 am

First thing that I would do is check the wheel back to back dimension (0.575") as stated. Then I would closely observe the loco as it traverses the points/crossovers checking which bogie/wheelset derails. Check bogies for unobstructed swing.

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Re: Class20.

Postby TheLMSmodeller » Wed Aug 22, 2018 10:24 am

Check if your wheels are gauged correctly, many Hornby models are known to be under gauge from the factory, they normally work fine on Hornby points but anything else they may come off due to tolerances. You could also check if the point blades are fully across or if it 'jumps' on the points, this would mean it's flanges are too big (unlikely due to it's age).

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