balloon loop

短语

词形变化

balloon loops 复数 balloon loops

释义与例句

n.
  1. 1.

    A looped section of track that allows a rail vehicle or train to reverse direction without having to shunt or even stop.

    Balloon loops can be useful for passenger trains and unit freight trains, such as coal trains.

词源

From its typical shape.

来源：wiktionary