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This paper presents an architecture for cyber-physical systems resilient against external attacks and internal faults. The target CPS consists of multiple physical systems equipped with local embedded systems, a supervision module that oversees operations of the physical systems, and communication network connecting each physical system to the supervision module. We give an instantiation of the architecture on a radio-based train control system to demonstrate the resiliency under various safety critical scenarios. The testbed entitled KRS-DGIST includes a commercial train control and supervision software deployed in the Philippines. The railway installed sensors and other mechanisms are implemented reflecting the actual train control and supervision system, and the dynamics of the trains is computer simulated. Demonstrations are given with attacks on sensors, communication network, and embedded systems.