Front Bogie Derailing

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vangogh
Posts: 20
Joined: Fri Jul 05, 2019 4:11 pm
Location: Beckenham

Front Bogie Derailing

Postby vangogh » Tue Jan 21, 2020 4:05 pm

My loco's seem to derail the front bogie very easily. Has anybody fitted a light spring to the bogie pillar? I thought this might cure it.

4472
Posts: 141
Joined: Fri Sep 16, 2005 2:16 pm

Re: Front Bogie Derailing

Postby 4472 » Tue Jan 21, 2020 6:10 pm

Where do they derail and is it all with the same wheel layout
Great grandson of Peter Benjamin Spicer (LNWR retired)

vangogh
Posts: 20
Joined: Fri Jul 05, 2019 4:11 pm
Location: Beckenham

Re: Front Bogie Derailing

Postby vangogh » Tue Jan 21, 2020 7:17 pm

The Flying Scotsman 4-6-2 and Duke of Gloucester 4-6-2 seem mainly Ok. Tornado 4-6-2 seems to derail on taking a bend on an elevated section. The track is smooth but the front bogies on all these seem very lively. I thought a small light spring would keep a bit of pressure on the track.

Bigmet
Posts: 7039
Joined: Tue Aug 14, 2007 2:19 pm

Re: Front Bogie Derailing

Postby Bigmet » Tue Jan 21, 2020 7:41 pm

A light spring on the pivot will help, but there is something more fundamental to check first. I suspect these are all Hornby products? The bogies are mounted in a bent metal bracket screwed onto the chassis block. If this bracket is slightly bent or secured slightly out of position, it can lift the bogie slightly, and that's a recipe for derailment - the 'lively' action of the bogie is a good description such a problem produces.

Viewing with your eye level with the rail, very slightly lift the front of the loco. If that immediately starts to lift the bogie then adjustment is required. It's a small adjustment, and when done it should be possible to slightly lift the front and rear of the loco without the bracket contacting the bogie. Then see how the loco runs.

The spring needs to exert about 10g at most, which needs a very soft spring. Better no spring at all than something much too stiff! Mine come from pieces of springs from Bachmann locos: this maker put far too much spring pressure on carrying wheels when they started with UK models. A specialist model shop should be able to help.

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SRman
Posts: 1022
Joined: Fri Oct 03, 2008 2:26 am

Re: Front Bogie Derailing

Postby SRman » Tue Jan 21, 2020 10:58 pm

I agree entirely with Bigmet's analysis: check the bracket and see if it is lifting the front of the bogie slightly. I had to do this with one of my Hornby N15s. It only needed a slight bend downwards on the bracket's mounting arm to fix the problem (no spring necessary).


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