New silencers for Fleetline d-deckers
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• Special silencers — similar to those used on single-deckers — are being fitted to London Transport's Daimler Fleetline Londoner double-deckers in an effort to reduce noise and vibration. Twelve vehicles on route 124 in South London are being fitted with the silencers after complaints from local residents.
Sir Richard Way, LT's chairman, ordered research into the problem following complaints from Mr R. Moyle, MP for Lewisham North. Constituents in one street on the route had complained about the vibration caused by the vehicles as they accelerated from rest. The problem was not overall noise but a low frequency booming sound which led to complaints of rattling doors and windows in nearby houses.
Sir Richard told Mr Moyle that LT had tried out several different silencers and tests showed that these could reduce sound pressure by a quarter. A LT spokesman told CM this week that the Londoners were about 4-c1BA noisier than old-type doubledeckers but "conformed to the 89dBA limit". He declined to say just what figure the buses actually achieve under British Standard conditions. It is understood, that, provided tests are successful, all Londoners will be fitted with the revised silencer.