Switch Rail Clamp Scope of use of portable hook lock:
1 - Lock switch when repairing switch signal switch machine.
2 - Lock the switch when passing the special train.
3 - When a temporary power failure occurs, the train runs and locks the switch.
4 - Closed special line lock special line turnout.
5 - Line new switch lock new open switch open.
6 - Lock the switch during the construction of the special line.
