Six-week evaluation of CNG technology used extensively in continental Europe First bus operator in UK to trial new MAN vehicle which can also run on biomethane Stagecoach, one of the UK’s biggest bus operators, has launched a six-week trial in Liverpool of a new hi-tech bus powered by compressed natural gas (CNG). CNG-powered buses are used extensively in continental Europe, but this is the first trial of the MAN-manufactured vehicle in the UK. The 12-metre single-decker EcoCity bus has an engine that is quieter than traditional diesel-engined vehicles and also ha...