railcard

noun

1. 火车乘坐优惠卡
   a card that allows sb to travel by train at a reduced price

1. 火车优惠购票卡
   A railcard is an identity card that allows people to buy train tickets cheaply.

1. Your Railcard is not transferable to anyone else.
   你的火车优惠卡不能转让给其他人。
2. With a Young Person's Railcard, students can save a third off of train fares.
   持学生火车优惠卡，就可节约三分之一的火车费。