It became necessary to paint the trains yellow in order to urge caution against attempting to cross the tracks after the crossing bars were lowered since even local trains picked up speed and had unobstructed views on straight line sections.
これは、直線区間が多く普通列車でもスピードを出すためや、直線のため見通しが良く、かえって油断して遮断機が降りても無理に横断する人や自動車に対して警戒を促すためのものである。