Green Railways — Set 4

Correct Answer: A. 2023

• **2023** = Indian Railways set the deadline of December 2023 to complete 100% electrification of all Broad Gauge (BG) tracks, covering roughly 63,000 route kilometres across the country. • **Scale of achievement** — by 2023 India had electrified more than 60,000 km of BG route, making it one of the largest railway electrification drives in world history. • Electrification eliminates diesel traction on main lines, directly cutting CO2 emissions and making Indian Railways eligible for the Net-Zero by 2030 target. • 💡 Option A (2023) is the correct answer. Option B (2025) is wrong because the official deadline was 2023, not 2025; Option C (2030) is wrong because 2030 is the net-zero carbon target, not the electrification deadline; Option D (2047) is wrong because that is India's Amrit Bharat centenary vision year, unrelated to BG electrification.

Correct Answer: D. Inoculum (Anaerobic bacteria)

• **Inoculum (Anaerobic bacteria)** = these specially cultured microbes break down human waste inside a sealed bio-digester tank, converting it into harmless water and biogas (mainly methane) through anaerobic digestion. • **DRDO origin** — the inoculum consortium was originally engineered by the Defence Research and Development Organisation for use in high-altitude Siachen glacier camps, then adapted for railway coaches in 2012. • Each tank contains about 25-30 litres of inoculum starter culture and can treat waste from an entire coach throughout its journey without any discharge onto the track. • 💡 Option A (Chlorine) is wrong because chlorine is a disinfectant chemical, not a biological agent that digests waste; Option B (Charcoal) is wrong because charcoal is an adsorbent used in water filters, not in bio-digesters; Option C (Sand) is wrong because sand is a filtration medium and plays no role in biological waste decomposition.

Correct Answer: D. Secunderabad

• **Secunderabad** = Secunderabad Railway Station (South Central Railway zone) became the first railway station in India to receive the prestigious IGBC (Indian Green Building Council) Platinum rating, the highest level of green certification. • **IGBC Platinum features** — the station runs entirely on solar energy, uses 100% LED lighting throughout its premises, and has a large-scale rainwater harvesting system that recharges groundwater. • The IGBC Platinum rating is India's equivalent of LEED Platinum and is awarded only to buildings meeting strict benchmarks in energy efficiency, water conservation, and waste management. • 💡 Option A (New Delhi) is wrong because New Delhi station, despite being the busiest, has not received IGBC Platinum status; Option B (Chhatrapati Shivaji Maharaj Terminus) is wrong because CSMT holds UNESCO World Heritage status for architecture, not IGBC Platinum; Option C (Jaipur) is wrong because Jaipur station is undergoing redevelopment but had not earned IGBC Platinum at the time of this recognition.

Correct Answer: D. Diesel

• **Diesel** = the Head-on Generation (HOG) system draws 750 V AC power directly from the overhead electric traction line to power hotel loads (lighting, fans, AC) in all coaches, completely eliminating the need for separate diesel-powered End-On-Generation (EOG) power cars. • **Savings figure** — a single Rajdhani Express on a 1,000 km journey saves approximately 2,400-3,000 litres of diesel under HOG, translating to a reduction of about 6-8 tonnes of CO2 per trip. • HOG also reduces train weight by removing heavy power car generators, which improves traction efficiency and lowers overall energy consumption per passenger-km. • 💡 Option A (Coal) is wrong because coal powers traction boilers in steam engines, not hotel loads in modern electric trains; Option B (Kerosene) is wrong because kerosene is not used as generator fuel in railway power cars; Option C (Petrol) is wrong because petrol is not used in diesel generator sets fitted to railway power cars.

Correct Answer: C. Green

• **Green** = green is the designated colour for Indian Railways eco-friendly branding, logos, and Mission Green initiatives; specially identified low-emission or biodiesel-powered trains carry green livery to signal their environmental credentials. • **Mission Green Railways** — launched under the National Action Plan on Climate Change, this initiative uses green as a visual identity across solar panels, green-certified stations, and eco-train branding. • Indian Railways uses colour coding widely: blue for conventional ICF coaches, red for Rajdhani/LHB air-conditioned stock, and green for heritage and eco-designated trains such as the Nilgiri Mountain Railway diesel sets. • 💡 Option A (Red) is wrong because red is the standard colour of Rajdhani Express and LHB air-conditioned coaches, not the eco-branding colour; Option B (Blue) is wrong because blue is used on conventional ICF sleeper and general coaches, not for green-mission identification; Option D (White) is wrong because white with blue stripe is the colour scheme of Vande Bharat and Shatabdi trains, unrelated to green certification.

Correct Answer: B. Loco-conversion

• **Loco-conversion** = this is the official term used by Indian Railways for the process of retrofitting old diesel locomotives with electric traction equipment so they can run under 25 kV AC overhead lines, extending their operational life while cutting emissions. • **Varanasi Workshop milestone** — the Diesel Locomotive Works (DLW), Varanasi, successfully converted WDG-3A diesel locos into 5,000 HP class electric locos, making it one of the first such large-scale conversions globally. • Conversion is far more cost-effective than procuring new electric locos: it costs roughly Rs 3-4 crore per loco versus Rs 15+ crore for a new locomotive, and the converted loco retains 70-80% of its useful mechanical life. • 💡 Option A (Loco-shunting) is wrong because shunting means moving coaches/wagons within a yard, not converting locomotive types; Option C (Loco-refitting) is wrong because refitting refers to general overhaul or interior changes, not a traction-system change; Option D (Loco-rehabilitation) is wrong because rehabilitation means restoring a worn loco to original specification, not changing its power source.

Correct Answer: B. DRDO

• **DRDO** = the Defence Research and Development Organisation developed the anaerobic bio-digester technology that forms the core of Indian Railways bio-toilet system, using a tailored consortium of microorganisms capable of surviving temperature ranges from -5 C to 50 C. • **Original purpose** — DRDO first developed this technology in the 1990s for sanitation at remote Siachen Glacier military posts, where waste disposal in sub-zero conditions was a critical hygiene challenge. • The Railways-DRDO partnership scaled this to over 2.5 lakh bio-toilets fitted across nearly all passenger coaches by 2019, virtually eliminating open-track defecation on the rail network. • 💡 Option A (ISRO) is wrong because ISRO works in space and satellite technology and had no role in developing bio-digester toilets; Option C (CSIR) is wrong because CSIR handles industrial and chemical research but did not develop the railway bio-digester consortium; Option D (IIT Delhi) is wrong because IIT Delhi may conduct related research but is not the originating organisation for this specific field-deployed technology.

Correct Answer: B. To generate solar power in less space

• **To generate solar power in less space** = solar trees are vertical metal structures with photovoltaic panels arranged like leaves on branches, maximising sun exposure across multiple levels while occupying only a small ground footprint, ideal for congested station premises. • **Output and design** — a typical solar tree at Indian Railways stations has a canopy diameter of about 5 metres, houses 10-16 panels, and can generate 5-10 kW of power, enough to light an entire platform or power several charging kiosks. • The design also provides incidental shade to waiting passengers, combining aesthetic value with functional energy generation in a single compact installation. • 💡 Option A (To provide shade only) is wrong because shade is an incidental benefit; the primary purpose is electricity generation; Option C (To plant more trees) is wrong because solar trees are steel-and-panel structures, not living plants used in afforestation; Option D (To decorate the platforms) is wrong because ornamentation is a secondary visual effect, not the engineering objective of solar tree installations.

Correct Answer: A. Green Corridor

• **Green Corridor** = a Green Corridor is a designated rail route on which every single train operating over that section is equipped with bio-toilets, ensuring zero discharge of untreated human waste onto the track bed. • **India's first Green Corridor** — the 114 km Rameswaram-Manamadurai section in Tamil Nadu was declared India's first Green Corridor in 2016, with all trains on that route fitted with bio-toilet-equipped coaches. • A clean track prevents accelerated corrosion of steel rails and concrete sleepers caused by urea in human waste, thereby reducing maintenance costs and extending track life. • 💡 Option B (Blue Corridor) is wrong because Blue Corridor is not an official Indian Railways term for waste-free tracks; Option C (Clean Route) is wrong because although descriptive, Clean Route is not the official designation used by the Ministry of Railways; Option D (Zero Waste Zone) is wrong because this term is used for solid-waste management at stations, not specifically for bio-toilet coverage on track sections.

Correct Answer: B. Solar

• **Solar** = Indian Railways plans to install 20 GW of solar capacity by 2030 on rooftops of stations and buildings, along trackside land, and at large solar farms, making solar the backbone of its renewable energy strategy. • **Land advantage** — Indian Railways owns approximately 51,000 hectares of non-operational land beside tracks, providing a massive ready-made surface for utility-scale solar farms without land acquisition costs. • Achieving 20 GW would meet roughly 40% of the railways total annual electricity consumption, displacing approximately 20 million tonnes of CO2 equivalent per year. • 💡 Option A (Nuclear) is wrong because setting up nuclear plants requires decades-long regulatory and construction timelines incompatible with a 2030 target, and railways have no mandate to operate nuclear reactors; Option C (Hydro) is wrong because hydropower requires rivers and large elevation differences unavailable along rail corridors; Option D (Tidal) is wrong because tidal energy is experimental in India and is not part of any Indian Railways energy plan.