tramcar：【英】有轨电车；矿车 streetcar：【美】(市内)有轨电车 trolley： 1.【美】有轨电车(=streetear);【英】无轨电车(=trolleybus) Cars and trolleys filled the street. 街上满是汽车和电车。 2. (电车等上端与架空电线接触的)触轮 3. 空中吊运车 4. 【主英】(装有脚轮的)小车;台车;手推车;手推餐车

there is no such thing as a trolley bus only a trolley car. or i have never heard of a trolley bus. hope that helped.