As the main part of a railway system, rolling stock presents some unique hardware design and protocol integration challenges, and requires a steady, reliable, and consistent platform. Major subsystems include monitoring of key components such as speed control, the brake safety system, mileage counter, door and window control, vehicle route monitoring, and power electronics response. Rolling stock applications include three major systems, each of which should be automatically monitored by the control center: Mobility Control Unit, Passenger Information System, and Network Video Recorder.  
Mobility Control Unit
This system includes a display panel to allow the conductor to monitor vehicle status. A powerful computing platform is used to connect various devices, such as analog/digital I/O units, GPS modules, audio devices, and wireless modules. Fast hand-over times from access point to access point enable immediate status updates to better control the railway system and keep passengers well-informed in all phases of the journey while still accommodating the mobile nature of ground-to-train communications.
Network Video Recorder
A reliable network video recording system is responsible for performing efficient and real-time video monitoring. With an industrial-grade PoE switch, it is easier to install VoIP phones and IP cameras on a platform where a power supply is not readily available. The nodes at the front and rear of the train need a higher level of performance in order to support NVR playback, but entry-level embedded computers with built-in storage expansion is enough to record video in the individual train carriages.
Passenger Information System
This system needs a powerful computing unit to quickly show information on the connected display. An industrial switch is also used for communications with the Ethernet network, and the system can be further expanded with passenger entertainment features.
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