One group is not marked in the traction of double-acting turnout.

According to the query reference network, a double-acting switch refers to a switch handle or switch button, which can switch the positions of two groups of switches at the same time or in turn, also known as a linkage switch. The advantage of double-acting turnout is that it can save cables and relays, and at the same time it can protect the route. There is a group of double-acting turnouts not marked, which may be due to the following reasons:

1. Mechanical failure of turnout, such as too tight adjustment of turnout, foreign objects in turnout, obstacles during turnout conversion, etc. , resulting in switch conversion is not in place or poor adhesion.

2. Switch circuit fault, such as indicating the change of pole gap, the inspection column can't fall into the pole gap, the contact of the switch machine is poor, the indicating circuit is open or the terminal contact is poor, and the rectifier diode is damaged. , resulting in the turnout can not give the correct indication signal.

3. Turnout control failure, such as the single control button stuck, the proximity lock failed, the interlock condition was not met, the turnout section was occupied by a car or the track circuit failed, which caused the turnout to be unable to operate or switch.