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HJS plus partner upgrading 637 Buses to meet Euro 6 standard
HJS plus partner upgrading 637 Buses to meet Euro 6 standard Grayson Thermal Systems and HJS Emission Technology are upgrading 637 buses owned by National Express West Midlands (NXWM) to achieve Euro 6 standards in a project that is thought to be one of the largest single-operator exhaust retrofit exercises in Europe. More information:https://www.route-one.net/top-story/complying-with-a-caz-made-easy/