The correct answer is A. TC-1425.
TC-1425 is the authority to serve the driver for train operation during TFC in double line. It is a document that is issued by the railway authority and it contains the instructions and procedures that the driver must follow when operating a train during TFC.
TFC stands for Train Following Control. It is a system that is used to control the movement of trains on a railway line. The system uses a series of signals to control the speed and direction of the trains.
Double line is a type of railway line that has two tracks. This allows trains to travel in both directions on the same line.
The driver is the person who is responsible for operating the train. The driver must follow the instructions and procedures in TC-1425 when operating a train during TFC.
The other options are incorrect because they are not the authority to serve the driver for train operation during TFC in double line.
B. TA-602 is the authority to serve the driver for train operation during single line.
C. TC-602 is the authority to serve the driver for train operation during normal conditions.
D. TD-1425 is the authority to serve the driver for train operation during emergency conditions.