Ask them when trains pass any given place, and counting off on their fingers they will quickly tell you the times, along with the numbers of the train services and even the types of bogies (wheel sets) the trains have, and whether they give a comfortable ride.
若問他們火車何時會從某地經過，掐指一算馬上可以報出時刻，連車次也一併奉送，甚至告訴你該車的轉向架（相當於汽車的輪子）是什麼形式，坐在車上舒不舒服。