Discuss the significance of hydrogen fuel cell technology for decarbonising India's railway network. Examine challenges in scaling it beyond pilot projects.

Indian Railways, targeting net-zero carbon emission by 2030, still runs substantial diesel traction on non-electrified and heritage routes. Hydrogen fuel cell trains—whose only by-product is water vapour—offer a clean-traction bridge, exemplified by India's first indigenous hydrogen train flagged off on the Jind–Sonipat section [1].

Significance for decarbonisation

• Zero tailpipe emissions: fuel cells generate power via a hydrogen-oxygen reaction, emitting only water vapour, cutting diesel's carbon and particulate load [1].
• Green-mobility ecosystem: paired with an electrolysis-based green hydrogen plant at Jind, it links rail transport to the National Green Hydrogen Mission (5 MMT target by 2030) [2][5].
• Indigenous capability: a 1200 KW, 10-coach Make-in-India trainset demonstrates domestic propulsion technology, reducing import dependence [2].
• Last-mile clean traction: viable for hilly, heritage and narrow-gauge lines where full electrification is costly—hence "Hydrogen for Heritage", targeting 35 trains [4].

Challenges in scaling

• Cost: green hydrogen remains expensive; refuelling and storage infrastructure demand heavy capital via IROAF-led projects [3].
• Safety & storage: high-pressure hydrogen handling needs strict protocols and skilled manpower.
• Efficiency gap: fuel-cell trains carry lower speeds (~75 kmph) versus electrified corridors [2].
• Supply constraints: limited electrolyser capacity and renewable-powered production restrict fleet expansion.

Hydrogen traction complements—not replaces—electrification, best deployed on hard-to-electrify routes. Scaling it demands cost reduction through Mission-linked incentives, safety standardisation and green-hydrogen supply security, advancing India's Net Zero 2070 and cooperative climate commitments.