"单节机动有轨车" can be translated as "single-section motorized tram" or "single-car motorized tramcar" in English.
"Single-section" or "single-car" indicates that it consists of only one carriage or section.
"Motorized" emphasizes that the vehicle is powered by a motor.
"Tram" or "tramcar" refers to a type of rail vehicle that typically runs on tracks in urban areas, often used for public transportation.
Both translations convey the meaning of a single-carriage, motor-driven vehicle that operates on tracks.