Discuss the significance of hydrogen fuel-cell technology in India's efforts towards decarbonising the transport sector, with reference to Indian Railways' hydrogen train initiative.

Q. Discuss the significance of hydrogen fuel-cell technology in India's efforts towards decarbonising the transport sector, with reference to Indian Railways' hydrogen train initiative. (15 marks, 250-350 words)

A hydrogen fuel cell generates electricity onboard through a chemical reaction between hydrogen and oxygen, leaving water vapour and heat as the only by-products [1]. India's first hydrogen train, flagged off on the Jind–Sonipat section of Northern Railway on 17 July 2026, makes this technology a working reality rather than a laboratory promise [1].

Why hydrogen matters for transport decarbonisation - Zero tailpipe emissions: combustion is replaced by an electrochemical reaction, cutting CO₂, particulates and noise at the point of use [1]. - High energy density: hydrogen carries about 120 MJ/kg against diesel's 43 MJ/kg, making it suitable for heavy, long-haul duty cycles where batteries are too bulky [1]. - Covers the electrification gap: non-electrified branch, hill and heritage routes, and heavy road freight, cannot be served by overhead traction — hydrogen offers a clean alternative. - Policy convergence: it operationalises the National Green Hydrogen Mission, under which hydrogen bus and truck pilots have also been launched [2].

Significance of the Railways initiative - Indigenous capability: a 10-coach trainset with two hydrogen driving power cars, carrying about 2,600 passengers at 75 kmph, demonstrates domestic design under Atmanirbhar Bharat [3]. - Ecosystem creation: an electrolysis-based green hydrogen plant and the country's largest railway hydrogen storage and refuelling facility (≈3,000 kg) at Jind show that fuel, not just the vehicle, is being localised [4]. - Scalability pathway: Railways plans 35 hydrogen trains under "Hydrogen for Heritage" on heritage and hill routes at ₹80 crore per train plus ₹70 crore per route of ground infrastructure [5].

Constraints remain — high capital cost, safety-critical high-pressure storage, and the fact that emissions are truly zero only if the hydrogen itself is green.

Hydrogen therefore complements, rather than replaces, electrification: the Jind–Sonipat train is a demonstration platform whose learnings can lower costs across rail and road freight. Scaling it alongside renewable-powered electrolysis will help India meet its net-zero-2070 and SDG-7 and SDG-13 commitments.

(~320 words)

Sources: 1. India's First Hydrogen-Powered Train: Advancing Green Rail Mobility, PIB (2026) — fuel-cell working, water vapour by-product, Jind–Sonipat flag-off, 120 MJ/kg vs 43 MJ/kg 2. Pilot Projects on Hydrogen Fuelled Buses and Trucks under the National Green Hydrogen Mission, PIB — hydrogen mobility pilots beyond rail 3. India's First Hydrogen Fuel Cell Train Set to Redefine Sustainable Rail Mobility with Capacity of Around 2,600 Passengers, PIB — trainset configuration, capacity, speed 4. Manufacturing of India's First Hydrogen-Powered Train-Set Completed; Green Hydrogen Plant at Jind, PIB — electrolysis plant and Jind storage/refuelling facility 5. Indian Railways to run 35 Hydrogen trains under "Hydrogen for Heritage", PIB — 35 trains, ₹80 crore per train, ₹70 crore per route