Trackside Installation
- Berlin S-Bahn rapid transit uses a metal bar as the trip arm, positioned at the height of the first bogie, on which the trip cock is placed. The metal bar (also named "Streckenanschlag" / track stop collar) folds away to allow passing.
- Berlin U-Bahn small profile underground uses a metal stick as a trip arm, which hangs over the track horizontally like a semaphore signal. The trip cock is on the roof of the first wagon (near the first door) almost looking like a lightning rod.
- Berlin U-Bahn large profile underground uses a mushroom-shaped swivel next to the right rail as a trip arm. The trip cock is mounted on the first bogie.
- New York City Subway uses a T-shaped metal bar rising from the floor as a trip arm; on the right side of the track for lines on the former IRT (numbered lines), and the left side for the former BMT/IND (lettered lines). To allow trains to proceed it pivots down. A trip cock is mounted on the corner of the truck (bogie) of each car. The placement of the trip cock depends on the division the train runs on; some rolling stock is equipped with a trip cock on both sides. The train stop can be identifed on the tracks because they are painted yellow for evidence if it has ever tripped a train
- Toronto Subway also uses a T-shaped metal bar that rises from the floor except its always on the right side of the track for all rolling stock because the trip cock is placed on the right side for all rolling stock.
- London Underground uses a square-shaped metal plate that functions similarly to that on the New York Subway system.
- Sydney now uses the London Underground type J trip arm called the JA, except that it is mirror-image mounted on the left hand side of the track instead of the right hand side.
Read more about this topic: Train Stop, Installations