On 5 June 2026 (World Environment Day), Railway Minister Shri Ashwini Vaishnaw reviewed India's hydrogen train programme and advanced maintenance facilities at the Shakur Basti depot in Delhi. For NDA and CDS aspirants, the news ties together two of the most heavily tested themes in science and current affairs — green hydrogen and Indian Railways' clean-energy transition. This article explains how a hydrogen train works and then builds out the policy and science behind it.
What happened
- The Railway Minister inspected the hydrogen train project and modern maintenance technology (including a Retractable Overhead Equipment system) at the Shakur Basti depot, Northern Railway.
- The review was part of Indian Railways' World Environment Day activities and its broader net-zero carbon commitment.
How a hydrogen train works
A hydrogen fuel-cell train carries hydrogen gas stored in onboard tanks. Inside a fuel cell, hydrogen reacts with oxygen from the air through an electrochemical process (the reverse of electrolysis) to generate electricity, which powers the train's electric traction motors. The only by-product is water vapour — there are no carbon emissions at the point of use.
Most such trains use a Proton Exchange Membrane (PEM) fuel cell, paired with batteries to store braking energy and manage power demand. Because they make their own electricity on board, hydrogen trains are ideal for non-electrified routes, hilly terrain and heritage lines where stringing overhead electric wires is uneconomical or visually intrusive.
Green hydrogen — the key concept
Hydrogen is the most abundant element in the universe, but on Earth it is locked up in compounds (like water) and must be produced. It is classified by how it is made — the "colours of hydrogen":
- Green hydrogen — produced by electrolysis of water using electricity from renewable sources (solar, wind). Genuinely low-carbon.
- Grey hydrogen — produced from natural gas (steam methane reforming), releasing CO₂. Most hydrogen today is grey.
- Blue hydrogen — grey hydrogen plus carbon capture and storage (CCS).
Only green hydrogen is consistent with deep decarbonisation, which is why the train's environmental value depends on using green hydrogen.
The National Green Hydrogen Mission
India's flagship policy is the National Green Hydrogen Mission, launched in 2023:
- It aims to make India a global hub for the production, use and export of green hydrogen.
- Target: roughly 5 Million Metric Tonnes (MMT) of annual green-hydrogen production capacity by 2030, with a large initial outlay (around ₹19,744 crore).
- It supports domestic manufacturing of electrolysers, renewable capacity addition, and demand creation in industry (steel, fertilisers, refineries) and transport.
- Hydrogen for transport includes the railways' "Hydrogen for Heritage" initiative, deploying hydrogen trains on selected heritage and hilly routes.
Hydrogen is valued because it can decarbonise "hard-to-abate" sectors — heavy industry and long-haul/heavy transport — where direct electrification is difficult.
Indian Railways and the Net-Zero goal
Indian Railways is one of the largest railway networks in the world (fourth-largest) and a huge energy consumer, so its greening is nationally significant. Its strategy:
- Become a "Net Zero Carbon Emitter" — among the most ambitious such targets by a national railway.
- 100% electrification of its broad-gauge network (already largely complete), replacing diesel traction.
- Massive deployment of solar and wind power for traction and stations, including solar panels on station roofs and dedicated renewable plants.
- Hydrogen trains for non-electrified and heritage routes under "Hydrogen for Heritage."
- Modern, energy-efficient rolling stock such as Vande Bharat and Amrit Bharat trains, and Dedicated Freight Corridors to move freight more efficiently.
Globally, the first hydrogen passenger trains entered service in Germany (the Coradia iLint), making India's indigenous development part of a small but growing club of nations pursuing hydrogen rail.
Hydrogen as a fuel — properties and uses
Hydrogen is attractive as a clean fuel for several reasons, and aspirants should know its basic properties:
- It has the highest energy content per unit mass of any common fuel.
- It is carbon-free at the point of use — burning or reacting it produces only water.
- It can be used in fuel cells (to make electricity) or burned directly.
Beyond trains, green hydrogen has wide applications: as a feedstock for fertilisers (green ammonia) and refineries, a reducing agent in green steel, a fuel for buses, trucks and shipping, and a way to store surplus renewable energy (converting excess solar/wind power into hydrogen for later use).
The main challenges are the high cost of green hydrogen today (driven by electrolyser and renewable-power costs), and the difficulty of storing and transporting a light, low-density gas safely. Bringing down these costs is the central aim of the National Green Hydrogen Mission.
Hydrogen valleys and India's roadmap
To build an ecosystem, India is developing Green Hydrogen Hubs / "hydrogen valleys" — clusters that integrate renewable power, electrolysers, storage and end-users (industry and transport) in one region. Public-sector energy companies are setting up large green-hydrogen and green-ammonia plants, and the railways' "Hydrogen for Heritage" trains are a visible demonstration project. India's ambition is not just to use green hydrogen domestically but to become a major exporter, supplying clean hydrogen and ammonia to global markets.
Why it matters
- Decarbonisation: hydrogen trains cut emissions on routes that cannot be electrified, complementing electrification.
- Energy transition: they link the transport sector to the emerging green-hydrogen economy and India's climate goals.
- Self-reliance: indigenous development of fuel-cell rail technology supports Aatmanirbhar Bharat and creates new manufacturing.
Electrolysis — the science in a bit more depth
The heart of green hydrogen is electrolysis — splitting water (H₂O) into hydrogen and oxygen by passing an electric current through it. An electrolyser contains two electrodes (anode and cathode) in water with an electrolyte; hydrogen collects at the cathode and oxygen at the anode. The two main technologies are Alkaline electrolysers and Proton Exchange Membrane (PEM) electrolysers. When the electricity comes from solar or wind, the hydrogen is "green." The efficiency and cost of electrolysers are key to making green hydrogen affordable, which is why India's mission promotes domestic electrolyser manufacturing through incentives.
The SIGHT scheme and incentives
Under the National Green Hydrogen Mission, the government runs the SIGHT programme (Strategic Interventions for Green Hydrogen Transition), which provides financial incentives for two things: domestic manufacturing of electrolysers and production of green hydrogen. By lowering costs on both the supply and demand sides, the aim is to make Indian green hydrogen cost-competitive with fossil-based hydrogen and with other countries — turning India into a manufacturing and export hub. Pilot projects span steel, shipping, transport (including trains and buses) and fertilisers, building the early demand needed for the industry to scale.
Key facts for your exam
- What: Railway Minister reviews hydrogen train; Date: 5 June 2026; depot: Shakur Basti, Delhi.
- Hydrogen train: fuel cell converts hydrogen + oxygen → electricity; by-product = water vapour; zero tailpipe carbon.
- Initiative: "Hydrogen for Heritage", backed by the National Green Hydrogen Mission (2023).
- Green Hydrogen Mission target: ~5 MMT/year by 2030.
- Railways goal: Net Zero Carbon Emitter; near-complete broad-gauge electrification.
- Colours of hydrogen: green (renewables), grey (natural gas), blue (grey + carbon capture).
Previous-year & expected exam questions
Q1. The only significant by-product of a hydrogen fuel-cell train is — Answer: Water (water vapour) — there are no carbon emissions at the point of use.
Q2. "Green hydrogen" is produced by — Answer: Electrolysis of water using electricity from renewable sources (solar/wind).
Q3. The National Green Hydrogen Mission targets an annual production capacity of about — Answer: 5 Million Metric Tonnes (MMT) by 2030.
Q4. Hydrogen trains are especially suited to which kind of routes? Answer: Non-electrified, hilly and heritage routes, where overhead electrification is uneconomical.
FAQ
Q1. How is a hydrogen train different from an electric train? An electric train draws power from overhead wires; a hydrogen train generates its own electricity on board using a fuel cell — so it needs no wires.
Q2. Why must the hydrogen be "green" for it to help the climate? Because if the hydrogen is made from fossil fuels (grey hydrogen), the emissions are simply shifted upstream. Green hydrogen, made with renewable electricity, keeps the whole chain low-carbon.
Q3. What are the "hard-to-abate" sectors green hydrogen targets? Heavy industries (steel, fertilisers, refineries) and heavy/long-haul transport, where direct electrification with batteries is difficult.
Q4. What is Indian Railways' clean-energy goal? To become a Net Zero Carbon Emitter through full electrification, large-scale renewable power, and hydrogen trains on non-electrified and heritage routes.
Q5. What is the SIGHT programme? Strategic Interventions for Green Hydrogen Transition — incentives under the National Green Hydrogen Mission for domestic electrolyser manufacturing and green-hydrogen production, to bring down costs.
Q6. What are "hydrogen valleys"? Regional clusters that integrate renewable power, electrolysers, storage and end-users (industry and transport) to build a complete green-hydrogen ecosystem in one place.
Quick revision recap
- Hydrogen train: fuel cell converts hydrogen + oxygen → electricity; by-product is water vapour; zero tailpipe carbon.
- Green hydrogen = electrolysis of water using renewable electricity (vs grey from gas, blue = grey + carbon capture).
- National Green Hydrogen Mission (2023): ~5 MMT/year by 2030; runs the SIGHT incentive programme.
- Railways' initiative: "Hydrogen for Heritage" on heritage/hilly routes.
- Indian Railways targets Net Zero via electrification + renewables + hydrogen.