DASH officials unveiled the city’s newest addition to its transit fleet Thursday evening, showcasing a pair of the clean diesel hybrid electric buses and King Street trolleys by Market Square.

Ten of the buses, manufactured by California-based GILLIG Corporation, will go into service in the coming months. The public can expect to see the new trolleys rolling down King Street in April.

Bought with a mix of state and federal dollars, the buses cost about $600,000 each. The trolleys cost an additional $55,000 per vehicle.

Officials expect the hybrid buses will burn about 2,000 fewer gallons of diesel annually than the older models and boast more spacious interiors for riders.