Case study · MPU

Main Processing Unit for AC coaches.

A public-safe overview of the embedded processing platform used in First AC, Second AC and Third AC coaches for passenger information, device coordination, route-aware operation and diagnostics.

Completed workIndian Railways context

Central processing for coach-level information and control.

The MPU is a C++/Qt Embedded Linux application that coordinates passenger-information functions and connected coach devices. The public view below describes capabilities and engineering responsibilities—not customer-specific internals.

Route awarenessGPS/NMEA-based route and station context.

Device coordinationDisplays and supporting coach-level subsystems.

Maintenance & diagnosticsStatus, logs, faults, testing and configuration workflows.

Embedded runtimeQt/C++ application on Linux-based embedded hardware.

Public architecture

How the MPU fits into the coach environment.

A simplified conceptual view—designed to communicate system scope without exposing implementation-sensitive topology.

GPS / Route Data

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Main Processing Unit

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Passenger Displays

PA / Audio

Coach Devices

Monitoring / Diagnostics