Green Railways — Set 1

Correct Answer: A. 2030

• **Net Zero Carbon Emitter by 2030** = Indian Railways officially adopted this target under its Mission Green Railways, committing to source all its energy from renewables and eliminate net carbon dioxide emissions entirely within this decade. • **100% broad-gauge electrification** — Indian Railways operates roughly 68,000 route km; completing electrification by 2023–24 is the single biggest step, saving over 2.8 billion litres of diesel annually. • Indian Railways is one of the world's four largest rail networks and the single largest institutional buyer of renewable energy in Asia, making this target globally significant. • 💡 Option B (2025) is wrong because that is the intermediate milestone for electrification completion, not the Net Zero declaration year; Option C (2035) is wrong because it confuses the target with some other sectoral decarbonisation plans; Option D (2047) is wrong because that is India's broader national Net Zero economy target (Amrit Kaal), not the railway-specific goal.

Correct Answer: C. Bio-Toilets

• **Bio-Toilets** = underground tank-based systems that use consortia of anaerobic bacteria developed by the Defence Research and Development Organisation (DRDO) to break down human waste into water, carbon dioxide, and methane, preventing any solid discharge onto the tracks. • **100% fitment milestone** — by March 2019, Indian Railways fitted all 2.5 lakh+ coaches with bio-toilets, eliminating an estimated 4,000 tonnes of solid waste deposited on tracks every day. • Steel rails corrode faster when exposed to urea and ammonia from untreated waste; bio-toilets have significantly reduced track maintenance costs in addition to improving hygiene. • 💡 Option A (Vacuum Toilets) is wrong because vacuum systems use suction pressure and still require a separate waste-holding tank, not the bio-digester bacteria process that defines this initiative; Option B (Chemical Toilets) is wrong because chemical toilets use formaldehyde-based disinfectants and do not biologically decompose waste; Option D (Waterless Urinals) is wrong because they address only liquid waste at fixed facilities, not the full coach sanitation system.

Correct Answer: D. Guwahati

• **Guwahati Railway Station** = the first Indian railway station to run entirely on rooftop solar power, achieved when a 700 kW solar plant was commissioned on its roof by Northeast Frontier Railway, meeting 100% of the station's daytime electricity needs. • **Rooftop capacity detail** — the 700 kW installation at Guwahati was one of the largest rooftop solar arrays on any railway station at the time of its commissioning, generating approximately 8–9 lakh kWh per year. • This milestone demonstrated that even stations in hilly, cloud-prone Northeast India could viably run on solar, encouraging similar projects at Secunderabad, Kacheguda, and other stations. • 💡 Option A (New Delhi) is wrong because New Delhi has solar panels but was not the first to be fully solar-powered; Option B (Bengaluru) is wrong because Bengaluru City station received IGBC ratings but achieved full solar operation later; Option C (Mumbai Central) is wrong because it is known for heritage architecture upgrades, not as the pioneer of full solar powering.

Correct Answer: A. Indian Green Building Council (IGBC)

• **Indian Green Building Council (IGBC)** = an industry body under the Confederation of Indian Industry (CII) that has developed a dedicated Green Railway Stations rating system assessing 10+ criteria including energy efficiency, water management, indoor environment quality, and sustainable materials. • **Rating tiers** — stations earn Certified, Silver, Gold, or Platinum ratings based on cumulative score; Platinum is the highest, and Secunderabad Junction was among the first major terminals to receive it. • IGBC adapted its Green Building norms specifically for railway stations in 2013, making India one of the few countries with a railway-specific green rating framework. • 💡 Option B (Bureau of Indian Standards) is wrong because BIS sets product and safety standards, not eco-performance ratings for buildings or stations; Option C (NITI Aayog) is wrong because it is a policy think-tank and does not issue infrastructure green certifications; Option D (Ministry of Environment) is wrong because the ministry frames environmental law and policy, not rating and certification services for buildings.

Correct Answer: C. To eliminate the need for power cars

• **Head-on-Generation (HOG)** = a system in which hotel load electricity (for lights, fans, air conditioning, and charging points inside coaches) is drawn directly from the 25 kV overhead electric traction line via a transformer on the locomotive, eliminating the need for separate diesel-powered generator cars (power cars) at the rear of the train. • **Diesel savings** — removing power cars saves approximately 4,000 to 5,000 litres of diesel per trip on a Rajdhani-class train; Indian Railways has converted all Rajdhani, Shatabdi, and Duronto trains to HOG, saving over 85 crore litres of diesel per year. • HOG also reduces noise by up to 10 decibels inside coaches because diesel generators are noisy, and it frees up two coach slots per rake that can now carry additional passengers. • 💡 Option A (To increase engine speed) is wrong because HOG concerns auxiliary power supply, not locomotive traction or speed; Option B (To improve track friction) is wrong because friction management is handled by sanding systems and wheel-rail interface technology, entirely unrelated to HOG; Option D (To reduce ticket prices) is wrong because ticket pricing depends on fare policy, not a specific technical system in coaches.

Correct Answer: D. West Central Railway

• **West Central Railway (WCR)** = headquartered in Jabalpur, Madhya Pradesh, WCR became the first Indian railway zone to achieve 100% electrification of its entire broad-gauge route network in March 2021, covering approximately 3,000 route km across Madhya Pradesh, Rajasthan, and Uttar Pradesh. • **Strategic significance** — WCR's electrification was completed under Mission Electrification, which targeted finishing all broad-gauge lines by 2024; as of 2023, only a few remote branch lines in hilly terrain remain. • Electric traction cuts per-unit energy cost by about 30% compared to diesel and reduces carbon emissions by over 70% per tonne-km when powered from renewable sources. • 💡 Option A (Northern Railway) is wrong because while NR is the largest zone, it had electrification work still pending on certain sections in 2021; Option B (Southern Railway) is wrong because SR had already achieved near-complete electrification years earlier and was not the first to declare 100% in this specific context; Option C (Western Railway) is wrong because WR covers Gujarat and Maharashtra trunk routes and had not completed 100% electrification before WCR did.

Correct Answer: A. Bifacial Solar Panels

• **Bifacial Solar Panels** = photovoltaic modules designed with transparent back-sheets or glass on both sides, allowing them to absorb direct sunlight from the front and reflected or diffused light from the rear, yielding 10–20% more energy than conventional single-face panels of the same area. • **Railway boundary application** — Indian Railways has been piloting bifacial panels installed vertically on track boundary walls and fences; this vertical orientation also acts as a physical barrier, reducing trespassing and cattle intrusion on tracks. • Indian Railways owns over 51,000 km of right-of-way land alongside tracks; deploying vertical bifacial panels on even a fraction of this length could generate gigawatts of solar capacity without acquiring additional land. • 💡 Option B (Solar Fencing) is wrong because solar fencing typically refers to electric security fences powered by solar cells, not the bifacial panel technology being trialled for boundary power generation; Option C (Solar Windows) is wrong because solar windows use transparent photovoltaic glass in building fenestration, not track-side boundary structures; Option D (Solar Pillars) is wrong because that term is not a defined railway solar technology and conflates support-structure naming with the panel type.

Correct Answer: C. Hydrogen Fuel Cells

• **Hydrogen Fuel Cells** = electrochemical devices that combine stored hydrogen with atmospheric oxygen to generate electricity on board the train, with pure water vapour as the only exhaust, making these trains genuinely zero-emission at the point of use. • **India's hydrogen train programme** — Indian Railways signed an MoU with BHEL and international partners to develop a hydrogen-powered train for the 96 km Kalka–Shimla narrow-gauge heritage route; Germany's Coradia iLint was the world's first hydrogen passenger train, entering service in Lower Saxony in 2018. • Hydrogen fuel-cell trains are particularly suited to non-electrified routes where overhead wire infrastructure is expensive to install, bridging the gap until full electrification is possible. • 💡 Option A (LPG) is wrong because LPG (liquefied petroleum gas) is a fossil-derived fuel that still emits CO₂ and is used mainly for cooking, not traction; Option B (Coal Gas) is wrong because coal gas produces higher carbon emissions than diesel and was largely abandoned as a fuel in the 20th century; Option D (Methanol) is wrong because while methanol can power internal combustion engines it still generates CO₂ and is not a fuel-cell clean-traction technology being piloted by Indian Railways.

Correct Answer: D. Platinum

• **Platinum** = the highest tier in the IGBC Green Railway Stations rating framework, awarded to stations that score above 75 out of 100 points across all sustainability parameters including water efficiency, energy performance, indoor air quality, waste management, and site ecology. • **Secunderabad Junction** — it was among the first large A1-category stations in India to receive the Platinum rating, having invested in rooftop solar, LED lighting throughout, rainwater harvesting pits, and extensive green landscaping. • The IGBC rating system for railway stations was launched in 2013; by 2022 over 60 stations had been rated, with the majority achieving Gold or higher. • 💡 Option A (Silver) is wrong because Silver is two levels below Platinum and is awarded for scores in the 50–60 range, not the top tier; Option B (Gold) is wrong because Gold is the second-highest rating, not the highest, requiring scores of 60–75; Option C (Diamond) is wrong because Diamond is not a category in the IGBC Green Railway Stations framework at all, making it a deliberate distractor.

Correct Answer: D. Recycled water

• **Recycled water** = Automatic Coach Washing Plants (ACWPs) treat and recirculate the same wash water through filtration and sedimentation units, recovering and reusing up to 80% of every wash cycle's water, which dramatically cuts fresh-water consumption compared to manual hosing. • **Speed and efficiency** — an ACWP can wash an entire 24-coach rake in about 15 minutes, whereas manual washing of the same rake takes 2–3 hours and uses 4–5 times more water; ACWPs are installed at major depots like Sabarmati, Perambur, and Santragachi. • Indian Railways uses ACWPs as part of its 'Water Positive' goal of recycling more water than it draws from natural sources at its maintenance facilities. • 💡 Option A (More water than manual) is wrong because the ACWP specifically uses far less water than manual washing, which is the entire purpose of its design; Option B (Seawater) is wrong because desalination and seawater handling infrastructure does not exist at inland depots where ACWPs operate; Option C (No water at all) is wrong because coach exteriors require water-based washing to remove grime; dry-cleaning technology is not currently deployed for full-rake exterior washing.