Reliability assessment of the TP62 executive unit in railway automation and telemechanics systems

Abstract

This article investigates the reliability of TP62 execution unit blocks, which are critical components of
railway automation and telemechanics systems. The study employs a Markov continuous-time stochastic
process model and a system of Kolmogorov differential equations to analyze the transition dynamics
between operational, degraded, and failure states. To enhance system dependability, a structural parallel
redundancy scheme is proposed, and its effectiveness is validated through rigorous mathematical
derivations. Numerical results demonstrate that the Mean Time To Failure (MTTF) for the redundant
TP62 configuration reaches 87,143 hours, equivalent to approximately 10 years of continuous operation.
The findings hold significant practical value for the design and maintenance planning of safety-critical
railway signaling and control infrastructure.