機場捷運之正線、維修機廠內駐車廠及測試線之軌道末端均設置止衝擋，以防止列車因煞車不及而衝出軌道。本計畫所使用止衝擋係藉由摩擦力來緩衝列車的撞擊力，達到阻擋的功能。其能承受車速為 8 km/hr 至25 km/hr 的全負載列車之撞擊，一組止衝擋配置16副摩擦元件，可承受之最大衝擊力為 960 KN。
Buffer stops are installed on TIAA MRT main lines, stabling yards in maintenance depots and the ends of testing rails to prevent trains from driving out of track due to malfunctioning braking systems. The mechanism of the buffer stops used in the TIAA MRT system is using frictional force to buffer impact force from the operational train. The buffer stop can effectively buffer the impact of a fully loaded operating train from 8 km/hr to 25 km/hr. Each buffer stop is equipped with 16 pairs of friction elements which can bear up to 960KN impact force.
Installation process of the buffer stop is as follows: first, the guide claws are removed from the main structure of the buffer stop and the buffer stop is lifted up by a crane with lifting loop and unloaded onto the rail with the buffer stop face facing the direction of the operating train; next, after marking the installing position of the friction elements on the rail head and the exact position on the rail web, the buffer stop was lifted away from the rail; then, insert the lubricated bolts and clamp bolts into the bolt holes, install the filling blocks on the rail head and install two supports at the opposite position of the filling blocks; hereafter, put double strip washers and flanged nuts inside the supports and use a torque wrench to tighten the bolts in the friction elements at 150N-M; lastly, reload the buffer stop onto the marked position, reinstall guide claws, insert bolts on the same side of the rail and use a torque wrench to tighten the bolts in the guide claws at 250N-M.
Installation of buffer stops has been completed at the rail tail of Taipei Main Station (A1), Linkou Station (A9) of the Linkou branch line, Kengkou Station (A11) of the reserved cargo park branch, Dayuan Station (A15) of airport shuttle park branch, rail tail of Huanbei Station (A21), two testing rails in the maintenance depot and stabling yard rails.