train-spotter

n person who collects the numbers of railway locomotives he has seen, as a hobby 搜集自己见过的机车号码的人（作为爱好）.

traffic warden, traffic-light (also `stoplight), trafficator, trafficker, tragedian, tragedienne, tragedy, tragic, tragically, tragicomedy, tragicomic, trail, trail off, trail-blazer, trail-blazing, trailer, train, train compartment, train set, train-bearer, trainee, trainer, training, training-college, trainman, traipse, trait, traitor, traitorous, trajectory, tram, tramlines, trammel, trammels, tramp, trample, trampoline, trance, tranquil, tranquility,