Trelleborg Industrial AVS has won a major contract in the secondary suspension of Indian Railways’ WAG 7 locomotives with their Metalastik sidebearer springs.
Originally selected in the mid 1970s, the Metalastik sidebearers achieved a life of six years despite the forces exerted by tight turns on the track.
A subsequent change to locally-manufactured parts resulted in a reduction to just nine months in service and so Indian Railways returned to the original Trelleborg product in 2000.
Since then the company has supplied over 17,000 units and the service interval is back at six years once again.
Ian Sutherland, Key Account Manager at Trelleborg Industrial AVS, commented:
“We are very proud that our long-standing technical collaboration with Indian Railways has resulted in yet another order for this highly successful locomotive.
“The quality of the Metalastik product and its engineering has created a lasting solution for a very demanding application and, by working closely with the customer’s engineers we have been able to further increase the product’s performance.”
The Metalastik sidebearer is a robust rubber/metal laminated sandwich mount, fitted to the locomotive bogie to absorb high levels of noise and vibration.
They are designed to allow bogie rotation, track twist and lateral displacement. In a revised geometry some designs can also be used as traction centres.
Of the 2,000 units in the current order, the majority will be fitted in new-build locomotives, while the remainder will be used as retrofit replacements in the refurbishment of older freight locomotives.
WAG-7 is a Co-Co electric locomotive with a maximum operating speed of 100 kph.
Indian Railways’ Chittaranjan Locomotive Works (CLW), one of the leading manufacturers of electric locos in the ASEA region, is responsible for both the mechanical and electrical build of the locomotive and some 300 have entered service since 1992.
The sidebearer springs will be supplied via M/S Ashika Commercial PVT. Ltd. of Calcutta, the Trelleborg Industrial AVS distributor in India.
