Editing Train stop (section)

===Trip stops===
<!--[[Image:ON-TTC 20071110 SubwaySignalling-TrippingArm Union.jpg|right|thumb|A raised trip arm]]-->
The trip arm is raised whenever the signal is not displaying a proceed aspect. If a train tries to pass the signal, the trip cock on the train strikes the raised trip arm and the train is brought to a halt. When the signal indicates it is safe to proceed ''(clear or caution)'', the trip arm is lowered, and a train is able to proceed without further hindrance. In some cases, the trip arm will not be lowered when the signal to which it applies is exhibiting a proceed indication, e.g. when subsidiary signals are cleared, forcing a train to trip before proceeding, thus ensuring that movements are conducted at safe speeds.