The token is the train's safe-conduct pass on a single track section of line, and prevents head-on collisions. Most of Taiwan's rail network has already converted to computer-controlled signaling, and the use of tokens now only survives on the Hualien-Taitung line and certain branch lines.
這是火車的通行證，作用是避免火車相撞，現在僅剩花東線及支線還有這古早的玩意兒，其他路段都改為電腦操作的電氣號誌了。