Abstract

This paper systematically investigates the data privacy protection strategies in railway transportation systems, with a particular focus on the unique requirements of train coupling/decoupling scenarios. In such dynamic and semi-open environments, existing passive security mechanisms and centralized architectures often fail to ensure secure data exchange and privacy preservation, particularly under limited computational resources. To address these challenges, we review decentralized data-sharing technologies and privacy-preserving computation methods suitable for heterogeneous train networks.  Furthermore, we propose a blockchain-based asymmetric encrypted storage framework and a collaborative computing architecture based on federated learning, both tailored to the operational constraints of modern high-speed trains. Our approach integrates container virtualization, secure consensus protocols, and differential privacy techniques to enable traceable, tamper-proof, and privacy-aware data processing. Finally, this paper outlines future research directions concerning quantum-resistant security architectures and adaptive privacy mechanisms that can support the evolving needs of intelligent railway systems.