Restoring Met 353 – Testing of safety critical components

Wheel Sets

During May safety critical components such as the draw hooks and wheelsets were carefully cleaned and NDT tested (Non Destructive Testing). This important procedure highlights any defects within metalwork that could later lead to failure of the part in service. Thankfully the majority of components passed the examination, however a number of brake block carriers failed and replacements duly sourced. When complete the carriage will have a dual (air and vacuum) braking system fitted, allowing it to be compatible with a range of heritage rolling stock. Interestingly, a number of ex London Underground A-Stock components have been recovered for re-use on the carriage braking system. Items include an auxiliary reservoir tank and two pressure gauges formally fitted to 6136 and 5136.

The profile of the wheels was checked last year and the shape found to be fairly good – A moderate amount of wear was discovered but well within intervention limits. There are currently no plans to re-profile the wheels (now close to P8) and they should be good for another 100,000 miles!

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