Evolution of Train Power Architecture

Indian Railways employs three distinct technical architectures for feeding electrical hotel load across passenger trains: Self Generation (SG): Individual coaches rely on under-slung belt-driven alternators connected to axles. Extremely heavy battery weight, low efficiency, and high maintenance overhead. End On Generation (EOG): Dedicated Power Cars at front and rear end with 500 kVA Diesel Generators (DG sets). Incurs high diesel fuel costs, severe noise/smoke pollution, and loss of commercial coach space. Head On Generation (HOG – Medha Solution): The locomotive taps power directly from overhead 25 kV AC catenary (OHE) via the pantograph. The main transformer steps down power to two 960 V single-phase hotel load windings. Two Medha MCN504V2 500 kVA Converters synthesize clean, highly stable 750 V 3-phase 50 Hz AC power, eliminating diesel consumption and generator cars.

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