CBTC stands for?

• A. Computer Based Train Control
• B. Centralized Bus Train Control
• C. Conditioned Brake Train Control
• D. Communication - Based Train Control

Answer: (D)

CBTC is a signaling approach that relies on two-way, continuous communication between trains and trackside equipment to determine precise train location and control movements. The name emphasizes that control decisions come from information transmitted between the train and the signaling system, rather than being based solely on fixed track circuits or purely centralized hardware. This communication-based foundation enables moving-block signaling, allowing trains to run closer together safely, which increases capacity and improves safety.

That’s why the correct term is Communication-Based Train Control. The other options describe different, nonstandard or unrelated concepts (computer-based, centralized data-bus, or conditioned brake concepts) and don’t capture the actual signaling approach CBTC uses.