The correct answer is: A. PLCT.
PLCT stands for Permanent Locomotive Running Time Table. It is a document that outlines the specific procedures that must be followed when shunting in a D/L block section. The PLCT includes information such as the location of the shunt points, the speed limit at which shunting can be performed, and the safety precautions that must be taken.
Shunting is the movement of locomotives and rolling stock within a railway yard or depot. It is a complex operation that requires careful planning and execution. The PLCT ensures that shunting is carried out safely and efficiently.
B. T-369(3b) is a document that outlines the procedures for working in a D/L block section. It does not specifically address shunting operations.
C. T-806 is a document that outlines the procedures for working in a D/L block section with a train. It does not specifically address shunting operations.
D. A simple memo is not a formal document and does not provide the level of detail or guidance that is required for shunting operations in a D/L block section.