What does the Blocking Device Removed (BDR) Code consist of?

The Blocking Device Removed (BDR) Code consists of a unique, random number from a control center that serves as a safety mechanism within the transit system. This code is crucial for communication among conductors and other operational personnel because it signifies that a blocking device, which is used to prevent access to certain track segments, has been deactivated for maintenance or operational reasons. The use of a unique number helps in accurately identifying the situation and avoids confusion that might arise if multiple devices were to be referenced.

This system is essential for maintaining safety protocols, ensuring that only authorized changes are made to track access, and enabling a clear understanding of which sections of the track are open or closed for operations. It allows for efficient operational management and clear communication between the control center and train operators.

The other options do not accurately describe the BDR Code: a fixed signal indicating block limits is related to signaling rather than codes; a specific type of track car does not pertain to the coding system; and an arrangement of interlocking signals refers to another safety mechanism entirely, distinct from the BDR Code.