Brake 1474 – work on suspension

Bogie Brake 1474 has been the subject of investigation and repairs to the bogie springing during 2019. This has prevented its use in service trains but the Worth Valley agreed that it could be used for a filming contract (see news item Filming for NETFLIX) along with our 6-wheelers. The main issue is that 1474 rolls quite a bit when in use, probably indicating that there is weakness in the suspension almost certainly due to its age.

The bogie suspension consists of primary and secondary (or auxiliary) components. The primary suspension comprises large coil springs located in the central bolster, the secondary being the leaf springs located over each axlebox together with a pair of auxiliary coil springs located at the outer end of each leaf spring.
Much of the investigation work has taken place with the active co-operation of the Worth Valley’s Director of Engineering, the Worth Valley having responsibility for the safety of the carriages when in use.

January 2020 it’s been established that the auxiliary coil springs in the secondary suspension have insufficient strength so 16 replacements are now on order thanks to a very good response to a fundraising request. Copies of the original L&YR general arrangement drawings of the bogies were obtained in 2019 via the Lancashire and Yorkshire Railway Society and it’s been found that the full specification for the replacement springs was detailed on the drawings. The material used over 100 years ago is now hard to obtain, so an alternative design has been established and approved by the Worth Valley’s Director of Engineering.
Springs removed for testing have been being temporarily replaced with steel tube. Examples of the auxiliary coil and leaf springs can be seen below along with an example of the securing bolts, some of which may need replacement due to 100 years plus of wear. The photos are supplied by the Trust’s team of of Jim Hindle, David and Daniel Winters as well as Trustee Peter Eastham.
Click on any image to view large version and as a slideshow

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