(for trains, aircraft, buses etc. to) to operate / to revolve

service of a form of transportation / revolution, orbit

an electric multiple unit train

(rail transport) inner track of a loop line

回り: circumference, perimeter, edge; surroundings; rotation, circulation

空回り: idle an engine; waste effort

空回り: idling an engine; wasting effort

回り: circumference, perimeter, edge / 回り: via, by way of that place / 回り: the round of something or someone / 回り: a span of twelve years / 回り: a unit of size in clothing

a turn, times around something

to make a detour / to go around