Abstract:
Communications Based Train Control (CBTC) provides positive train separation, over
speed protection, and protection for roadway workers. Current system designs do not include
trust management systems to provide support for security, rendering CBTC communications
vulnerable to malactors. Traditional train control methods and the architecture
of CBTC systems are studied to determine specific vulnerabilities of CBTC systems and the
associated system security requirements. The security requirement are then used to derive
an appropriate trust management system. Existing work on safe cross domain dispatch
operations has not considered the impact of these trust management systems on allowable
traffic delays and system velocity or related them to train dynamics. A relationship between
train dynamics and trust management delay is presented to allow engineering estimates of
the practicallity of potential trust management systems to support rail operations while
preventing collsions. An algorithm for the safe and secure scheduling of trains through the
interchange point between is provided. The algorithm supports positive train separation
under a worst-case traffic scenario, allowing for safe and secure scheduling while reducing
traffic delays. The approach presented is illustrated by an example, and is independent of
the specific security management, CBTC, and dispatch systems.
