网上订票 online booking service system;
铁路客运 passenger rail transport;
豪华座 luxury train seat;
普通座 standard seat;
硬卧 hard sleeper;
软卧 soft sleeper;
硬座 hard seat;
软座 soft seat
铁路客运的高峰期 peak railway travel season;
C字头城际 inter-city trains;
G字头高铁 high-speed rails;
K字头快速 fast trains;
T字头特快 express trains;
Z字头直达 non-stop trains