The bus can carry up to 16 passengers and features wheelchair access with low floors, power doors and seat belts.
The fuel-efficient Orion also features a rapid slide electric door, front ramp with centre handle, 2m-long fold out ramp to the rear and reversing camera with dash-mounted monitor.
Peter Colvin, fleet operations manager at Dorset County Council, says: “We specified the Orion with its ultra-low floor to offer our passengers the comfort and accessibility they require.
“We currently operate a fleet of 96 vehicles, 31 of which are Mellor and we have been pleased with the reliability and flexibility of the bus to meet the needs of the council’s various transport routes.
“Our services are extremely important to many local residents, some of which are less mobile or live in more remote rural areas.”