rail1/rel; reIl/n 1 [U] the railway system 铁路系统: the UK rail network 英国铁路网络by rail people who travel by rail 乘火车旅行的人2 [C usually plural 一般用复数] one of the two long metal tracks that trains move along 铁路路轨3 [C] a bar along or around something, usually to stop you falling 扶手﹔栏杆4 [C] a bar that you use to hang things on〔挂东西用的〕横杆: a towel rail 毛巾杆