But halfway down the block from the bus stop there was a barber pole reflecting a candy cane of light from the window.

但从公车站走向街区的半路上，有个理发店的招牌，反射出来自窗户的旋转彩柱灯光。

These are 60-foot-tall tubes that spin around like hyperactive barber's poles, which produces a forward thrust and reduces demand on the diesel engines.

这种设备是高达60英尺的管道，像超活跃版理发店旋转招牌一样旋转，提供了一个向前的推力，减少了对柴油发动机的需求。