On 16 July 2026, Indian Railways announced that India's first hydrogen fuel-cell trainset was ready to be flagged off (on 17 July) on the Jind–Sonipat section of the Northern Railway in Haryana. The train generates its own electricity on board from hydrogen, emitting only water vapour — a landmark in green rail mobility. For an NDA aspirant, this is a superb science-and-technology topic: it teaches how a fuel cell works, what green hydrogen is, and how India is decarbonising transport — themes that recur across physics, chemistry and current affairs.
The news in one frame
The essentials:
- What: India's first hydrogen fuel-cell train, on the Jind–Sonipat route (Northern Railway, Haryana).
- Capacity: ~2,600 passengers across 10 coaches, top speed ~110 km/h.
- How: an onboard hydrogen fuel cell makes electricity to drive the motors — by-product is water vapour (near-zero emissions).
- Ecosystem: a full hydrogen plant at Jind — production (electrolysis), storage, and refuelling — supports the National Green Hydrogen Mission.
How a hydrogen fuel cell works
Start with the core science — a favourite NDA question. A fuel cell is a device that converts the chemical energy of a fuel directly into electricity through an electrochemical reaction (not by burning it). In a hydrogen fuel cell (typically a PEM — Proton Exchange Membrane type):
- Hydrogen (H₂) is fed to the anode, where it splits into protons (H⁺) and electrons.
- The protons pass through the membrane, while the electrons are forced through an external circuit — that electron flow is the electric current that powers the train's motors.
- At the cathode, the protons, electrons and oxygen (O₂) from the air recombine to form water (H₂O).
So the only tail-pipe output is water vapour and heat — no smoke, no CO₂ at the point of use. The overall reaction is simply 2H₂ + O₂ → 2H₂O + electricity. Crucially, a fuel cell is not a battery: a battery stores energy, while a fuel cell keeps generating electricity as long as hydrogen is supplied. This clean-energy physics connects to the NDA notes on energy.
What is "green" hydrogen?
The colour coding of hydrogen is genuinely examinable:
- Green hydrogen — made by electrolysis of water (splitting H₂O into H₂ and O₂) using renewable electricity (solar/wind). Zero-carbon.
- Grey hydrogen — made from natural gas (steam methane reforming), releasing CO₂ (most hydrogen today).
- Blue hydrogen — grey hydrogen but with the CO₂ captured and stored.
The Jind plant makes green hydrogen via electrolysis, so the whole chain — from production to the train — can be carbon-free. Hydrogen is the most abundant element in the universe and, by mass, the most energy-dense fuel — but it is light, must be stored at high pressure, and is flammable, which is why the train has multi-layer safety systems to detect leaks, heat, flame and smoke. These applied themes run through the NDA daily current affairs.
The National Green Hydrogen Mission
Place the train in national policy:
- The National Green Hydrogen Mission was launched in 2023 with an outlay of ₹19,744 crore, aiming to make India a global hub for green hydrogen production and export.
- Target: about 5 million tonnes of annual green-hydrogen production capacity by 2030, cutting fossil-fuel imports and CO₂.
- Green hydrogen is meant to decarbonise "hard-to-abate" sectors — steel, fertiliser, refining, heavy transport and shipping — where batteries alone don't fit.
Indian Railways, targeting net-zero carbon emissions, sees hydrogen trains as the next step after electrification for routes that are hard to electrify. The revision hook: hydrogen fuel cell → H₂ + O₂ → water + electricity (PEM type); green hydrogen = electrolysis with renewables; National Green Hydrogen Mission (2023, ₹19,744 cr, 5 MT by 2030); India's first hydrogen train on the Jind–Sonipat section, ~2,600 passengers.
How the railways got here
A short evolution NDA aspirants can cite:
- Steam (coal) → diesel → electric traction, and now hydrogen — each step cleaner.
- India has already achieved over 99% broad-gauge electrification, sharply cutting diesel imports.
- Hydrogen "Hydrail" targets sections where overhead electrification is impractical, and heritage/hilly routes — extending clean traction everywhere.
Why it matters strategically
For the SSB and the bigger picture:
- Energy security: home-made hydrogen (from India's own solar/wind) reduces dependence on imported oil.
- Climate commitments: it supports India's pledge of net-zero by 2070 and its Panchamrit goals.
- Technology leadership: mastering fuel cells and electrolysers positions India in a strategic future industry — with dual-use potential (fuel cells power submarines and remote military posts too).
Exam relevance in one paragraph
For NDA General Science, retain: a hydrogen fuel cell converts chemical energy directly into electricity — H₂ at the anode splits into protons and electrons, electrons flow through the circuit (current), and O₂ + H⁺ + e⁻ form water at the cathode (2H₂ + O₂ → 2H₂O + electricity), emitting only water vapour; unlike a battery it runs as long as hydrogen is supplied; green hydrogen is made by electrolysis using renewables (vs grey from natural gas); the National Green Hydrogen Mission (2023, ₹19,744 crore) targets ~5 MT by 2030; India's first hydrogen train runs on the Jind–Sonipat section. For the SSB, it exemplifies clean-energy self-reliance.
🎯 Practice MCQs
Q1. A hydrogen fuel cell produces electricity along with which by-product? (a) water (b) carbon dioxide (c) sulphur dioxide (d) methane → (a) — water (vapour) and heat.
Q2. The overall reaction in a hydrogen fuel cell is: (a) 2H₂ + O₂ → 2H₂O (b) C + O₂ → CO₂ (c) N₂ + 3H₂ → 2NH₃ (d) 2H₂O → 2H₂ + O₂ → (a) — hydrogen + oxygen → water (+ electricity).
Q3. A common type of fuel cell used in vehicles/trains is the: (a) PEM (Proton Exchange Membrane) (b) lead-acid (c) dry cell (d) solar cell → (a) — the PEM fuel cell.
Q4. "Green" hydrogen is produced by: (a) electrolysis of water using renewable energy (b) burning coal (c) natural gas reforming (d) nuclear fission → (a) — electrolysis powered by renewables.
Q5. Hydrogen made from natural gas (releasing CO₂) is called: (a) grey hydrogen (b) green hydrogen (c) blue hydrogen (d) black hydrogen → (a) — grey hydrogen.
Q6. India's first hydrogen train runs on which section? (a) Jind–Sonipat (b) Delhi–Agra (c) Mumbai–Pune (d) Chennai–Bengaluru → (a) — the Jind–Sonipat section (Haryana).
Q7. The National Green Hydrogen Mission was launched in: (a) 2023 (b) 2014 (c) 2030 (d) 2005 → (a) — 2023 (outlay ₹19,744 crore).
Q8. How does a fuel cell differ from a battery? (a) it generates power as long as fuel is supplied (b) it stores a fixed charge (c) it needs no reactants (d) it burns fuel → (a) — it keeps producing electricity while fuel flows in.
Q9. In a hydrogen fuel cell, electrons flow through the external circuit from the: (a) anode to the cathode (b) cathode to the anode (c) membrane to the air (d) water to hydrogen → (a) — anode to cathode (that flow is the current).
Q10. The most abundant element in the universe is: (a) hydrogen (b) oxygen (c) carbon (d) iron → (a) — hydrogen.
Q11. Splitting water into hydrogen and oxygen using electricity is called: (a) electrolysis (b) electroplating (c) distillation (d) combustion → (a) — electrolysis.
Q12. Green hydrogen is especially useful for decarbonising: (a) hard-to-abate sectors like steel and fertiliser (b) household lighting only (c) farming only (d) nothing → (a) — heavy industry and transport.
Q13. "Blue" hydrogen is grey hydrogen combined with: (a) carbon capture and storage (b) solar panels (c) wind farms (d) nuclear reactors → (a) — CO₂ capture and storage.
Q14. The hydrogen train emits near-zero emissions at the point of use because it: (a) does not burn fuel (b) uses diesel (c) uses coal (d) has no motor → (a) — it electrochemically produces power, not combustion.
Q15. Indian Railways' broad-gauge network is now electrified to over: (a) 99% (b) 40% (c) 10% (d) 75% → (a) — over 99%.
Q16. The National Green Hydrogen Mission targets annual production of about: (a) 5 million tonnes by 2030 (b) 50 tonnes by 2030 (c) 500 MT by 2027 (d) none → (a) — around 5 million tonnes by 2030.
📋 How this gets asked (PYQ pattern)
Clean energy is a fast-rising NDA science set. The reliable framings are how a fuel cell works (H₂ + O₂ → water + electricity), the hydrogen colour codes (green vs grey vs blue), fuel cell vs battery, and the National Green Hydrogen Mission facts. A common trap says a fuel cell emits CO₂ (it emits water) or confuses green with grey hydrogen. The fresh 2026 hook is India's first hydrogen train — ideal for "which by-product / which type / which mission" items. We reference the pattern, not any exact past question.
Preparing for the NDA? Fuel cells, hydrogen and clean energy are high-yield science GK and strong SSB talking points on sustainability and self-reliance. Follow our daily NDA current affairs and train with serving-officer faculty in the upcoming Cavalier courses in Delhi.
✍️ Written by Maj Sunil Chopra — Co-founder & defence faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk. The Cavalier, founded by ex-Army officers, has trained NDA/CDS/SSB aspirants since 2001 (Facebook · YouTube).
Source: PIB / Ministry of Railways release, 16 July 2026. Facts cross-verified with independent sources.