Railway cyber security systems

A system for providing security to a railway system, the system comprising: a data monitoring and processing hub; a network comprising a plurality of data collection agents synchronized to a same network clock and configured to monitor railway infrastructure devices and onboard devices of rolling stock having a train communication network (TCN), train to wayside communications (such as GSM-R) and forward monitored data to the hub for processing by the hub to detect anomalies in railway operation that are indicative of a cyber- attack; wherein an agent of the plurality of data collection agents monitoring an onboard device connected to the TCN of a given rolling stock receives signals propagated to or from the device via the TCN and forwards to the hub data based on a given received signal together with a time stamp comprising a network clock time at which the given received signal is received by the agent.