Bridges & Tunnels — Set 5

Correct Answer: A. Chenab Bridge

• **Chenab Bridge** = The Chenab Bridge is the world's highest railway bridge, standing 359 metres above the Chenab River in Reasi district, Jammu & Kashmir — taller than the Eiffel Tower (330 m). It is a steel arch bridge with a total length of 1,315 metres, built as part of the Udhampur–Srinagar–Baramulla Rail Link (USBRL) project. • **Engineering superlatives** — The arch span of 467 metres is one of the longest steel arch spans for a railway bridge in Asia; the bridge is designed to withstand wind speeds of up to 260 km/h and is also blast-proof, built to meet anti-terror specifications, with a design life of 120 years. • The Chenab Bridge was constructed by Afcons Infrastructure and was completed in 2022; it connects Bakkal and Kauri stations and will allow the Vande Bharat Express to travel to Kashmir once the full USBRL line opens. • 💡 Option B (Bogibeel Bridge) is wrong because Bogibeel is a long rail-cum-road bridge over the Brahmaputra at 32 metres height, not the world's highest; Option C (Pamban Bridge) is wrong because Pamban is a sea bridge at near-sea-level height in Tamil Nadu and holds no height record; Option D (Howrah Bridge) is wrong because the Howrah Bridge is a cantilever bridge over the Hooghly at just 26 metres above river level, not a high-altitude structure.

Correct Answer: C. Jammu and Kashmir

• **Jammu and Kashmir** = The longest railway tunnel in India — the Pir Panjal Railway Tunnel — is located in Jammu & Kashmir, piercing the Pir Panjal mountain range between Banihal (Jammu division) and Qazigund (Kashmir division) at an altitude of over 2,000 metres. It is 11.215 km long and was opened to passenger traffic on 26 June 2013. • **Significance** — The Pir Panjal Tunnel provides a year-round all-weather rail connection to Kashmir, bypassing the Banihal Pass which is snow-blocked for several months each year; before this tunnel, no railway existed between Jammu and Srinagar. • The tunnel was constructed using NATM and TBM methods; it reduced the travel time between Banihal and Qazigund from over 2 hours by road to under 20 minutes by train, and it forms part of the larger 272-km USBRL project. • 💡 Option A (Himachal Pradesh) is wrong because Himachal Pradesh's longest railway tunnel, on the Shimla–Kalka section, is only about 1.1 km long; Option B (Maharashtra) is wrong because Maharashtra's longest tunnel is the Karbude Tunnel at 6.5 km on Konkan Railway, which is shorter than the Pir Panjal; Option D (Uttarakhand) is wrong because Uttarakhand does not currently have a major operational railway tunnel anywhere near 11 km in length.

Correct Answer: A. Assam

• **Assam** = The Bogibeel Bridge, India's longest rail-cum-road bridge, is located in Assam, spanning the Brahmaputra River between Bogibeel (Dibrugarh district) on the south bank and Silapathar (Dhemaji district) on the north bank. It was inaugurated by Prime Minister Narendra Modi on 25 December 2018 — India's 70th Constitution Day. • **Bridge dimensions** — The Bogibeel Bridge is 4.94 km long, carries double-track railway on the lower deck and a 3-lane road on the upper deck; it was designed to withstand seismic Zone V (the highest earthquake risk zone in India) and was built by Hindustan Construction Company (HCC). • The bridge cuts travel time between Assam and Arunachal Pradesh from over 6 hours to under 1 hour and has immense strategic value, allowing rapid troop and equipment movement to the China border in the Northeast. • 💡 Option B (West Bengal) is wrong because West Bengal does not have a rail-cum-road bridge of this scale over the Brahmaputra, as the river does not flow through West Bengal; Option C (Bihar) is wrong because Bihar's major river bridges span the Ganga and Son, not the Brahmaputra; Option D (Arunachal Pradesh) is wrong because the north end of the bridge enters Dhemaji district of Assam, not Arunachal Pradesh — the bridge begins and ends in Assam.

Correct Answer: B. Pamban Bridge

• **Pamban Bridge** = The new Pamban Bridge, under construction in Tamil Nadu, will be India's first vertical lift railway sea bridge — a design where a central span can be mechanically raised vertically to allow tall-masted ships and vessels to pass through the Palk Strait between Mandapam and Rameswaram Island. The new bridge is being built alongside the existing 1914 Pamban Bridge. • **New bridge specifications** — The new Pamban Bridge will be 2.08 km long, designed for speeds up to 160 km/h, and will have an electro-mechanically operated vertical lift span of 63 metres that rises 17 metres above the sea level; it replaces the 110-year-old bascule (swing) span mechanism of the original bridge. • The original Pamban Bridge (1914) was India's first sea bridge and used a Scherzer rolling lift bascule mechanism for ship passage; the new bridge upgrades this with a fully automated vertical lift system, eliminating the risk of the old rolling mechanism jamming. • 💡 Option A (Vembanad Bridge) is wrong because the Vembanad Bridge in Kerala, though India's longest railway bridge (4.62 km), is a conventional fixed girder bridge over a backwater lake and does not have any lift or movable span; Option C (Havelock Bridge) is wrong because there is no sea bridge named Havelock Bridge in Indian railway records; Option D (Nehru Setu) is wrong because Nehru Setu is a fixed railway bridge over the Son River in Bihar and is neither a sea bridge nor a vertical lift bridge.

Correct Answer: B. Kerala

• **Kerala** = The Vembanad Rail Bridge, the longest dedicated railway bridge in India at 4.62 km, is located in Kerala, crossing Vembanad Lake (a backwater) to connect Edappally on the mainland with Vallarpadam Island in Kochi. It was built to serve the Vallarpadam Container Transshipment Terminal, India's first dedicated container terminal. • **Bridge details** — Completed in 2011, the Vembanad Rail Bridge has 106 spans and carries a single broad-gauge railway track; it was constructed at a cost of approximately ₹350 crore and is part of the strategic freight corridor connecting Kochi port to the national rail network. • Vembanad Lake, through which this bridge passes, is India's longest lake (96.5 km) and is a Ramsar-listed wetland; the bridge's construction required careful environmental clearances to protect the lake's delicate ecosystem and fishing communities. • 💡 Option A (Tamil Nadu) is wrong because Tamil Nadu's notable sea crossing, the Pamban Bridge, is only 2.06 km long — shorter than Vembanad; Option C (Andhra Pradesh) is wrong because AP's longest railway bridges are river bridges like those at Rajahmundry, none matching Vembanad's length; Option D (Karnataka) is wrong because Karnataka does not have a major dedicated railway bridge over a water body of comparable length.

Correct Answer: C. Golden Bridge

• **Golden Bridge** = The Golden Bridge (officially the Narmada Railway Bridge) connects Ankleshwar and Bharuch (Broach) in Gujarat and is popularly known as 'Sonar Quila' (Golden Fort) in railway literature due to its distinctive golden-yellow stone piers that give it a fort-like visual appearance, especially when lit at sunrise. It was built in 1881 over the Narmada River by the Bombay, Baroda & Central India Railway. • **Historical significance** — The bridge spans approximately 1,058 metres across the Narmada using 26 spans of iron girders on stone masonry piers; it is one of the oldest continuously operational railway bridges in western India and a heritage structure that has survived over 140 years including multiple Narmada floods. • The Narmada Bridge at Bharuch is significant not just historically but strategically — it lies on the main Mumbai–Delhi Western Railway route, handling some of the busiest freight and passenger traffic in India on a daily basis. • 💡 Option A (Howrah Bridge) is wrong because Howrah Bridge in Kolkata is a cantilever truss bridge over the Hooghly and has no association with the name 'Sonar Quila'; Option B (Chenab Bridge) is wrong because the Chenab Bridge in J&K is the world's highest railway bridge but is not called Sonar Quila and was completed in 2022; Option D (Saraighat Bridge) is wrong because the Saraighat Bridge in Guwahati is a rail-cum-road bridge over the Brahmaputra and holds no 'golden' nickname.

Correct Answer: C. Kolkata

• **Kolkata** = Kolkata is home to India's first underwater metro tunnel, built under the Hooghly River as part of the East-West Metro Corridor (Howrah Maidan to Esplanade). The twin underwater tunnels, each about 520 metres long, were bored at a depth of 30 metres below the riverbed using Earth Pressure Balance Tunnel Boring Machines (EPB-TBMs). • **Engineering milestone** — The tunnel boring was completed in 2017 by ITD Cementation using a specially designed TBM named 'Rachna'; the underwater section is the first of its kind in India and required precision pressure management to prevent water ingress while boring through alluvial riverbed soil beneath one of India's busiest rivers. • The Kolkata East-West Metro connects Salt Lake Sector V to Howrah Maidan (16.6 km); the underwater stretch opened to passengers in March 2024, and Kolkata thus became the first Indian city with an underwater metro, decades after pioneering India's first metro system in 1984. • 💡 Option A (Mumbai) is wrong because Mumbai's metro lines are either elevated or at shallow underground depth, with no tunnel passing under a major river; Option B (Chennai) is wrong because Chennai Metro has no underwater river tunnel — its underground sections are in soft Chennai clay, not under a major waterway; Option D (Delhi) is wrong because Delhi Metro, though the largest metro in India, does not have any tunnel running under a river as Delhi Metro crosses the Yamuna only via elevated bridges.

Correct Answer: C. Maharashtra

• **Maharashtra** = The Karbude Tunnel is located in Maharashtra, on the Konkan Railway route between Ukshi and Bhoke stations near Ratnagiri district. At 6.5 km in length, it passes through the Sahyadri (Western Ghats) mountain range and was the longest railway tunnel in India from its completion in 1997 until the Pir Panjal Tunnel (11.2 km) opened in 2013. • **Geological challenge** — The Karbude Tunnel was bored through Deccan Basalt, a hard but water-bearing volcanic rock; during construction, the tunnel encountered severe water inflows and fractured rock zones that required heavy grouting and steel arch supports, adding significantly to construction time and cost. • The Konkan Railway line passes through Maharashtra, Goa, and Karnataka, and the majority of its 91 tunnels, including Karbude, lie in the Maharashtra segment where the Western Ghats are at their steepest and most rugged. • 💡 Option A (Karnataka) is wrong because while Konkan Railway passes through Karnataka's coastal district, the Karbude Tunnel is in Maharashtra's Ratnagiri section; Option B (Goa) is wrong because Goa's Konkan Railway section has several short tunnels but none as long as Karbude; Option D (Kerala) is wrong because the Konkan Railway does not extend to Kerala — it terminates at Mangaluru in Karnataka.

Correct Answer: A. Noney Bridge

• **Noney Bridge** = The Noney Bridge (also called the Ijai Bridge) in Manipur is being built as part of the Jiribam–Imphal Railway Project and, upon completion, will be the tallest railway pier bridge in the world with a maximum pier height of 141 metres — surpassing the current record-holder in Montenegro. The bridge spans the Ijai River valley in Noney district. • **Project context** — The Jiribam–Imphal railway project is 111 km long and includes 29 tunnels (totalling 71 km) and 70 bridges (totalling 25 km); the Noney Bridge is the flagship structure among these, being a 703-metre long viaduct with 14 spans carried on piers of varying heights, the tallest reaching 141 m. • Constructing the Noney Bridge in Manipur's geologically unstable hills — prone to landslides, earthquakes, and heavy rainfall — required special deep-bored pile foundations and precision concrete work; the project is expected to transform connectivity for Manipur, which currently has no operational railway. • 💡 Option B (Anji Khad Bridge) is wrong because the Anji Khad Bridge in Jammu & Kashmir is India's first cable-stayed railway bridge, a different type and not a pier bridge record-holder; Option C (Dhubri-Phulbari Bridge) is wrong because the Dhubri-Phulbari Bridge is a road bridge being built on the Brahmaputra between Assam and Meghalaya, not a railway pier bridge; Option D (Jia Bharali Bridge) is wrong because the Jia Bharali Bridge is a road-rail bridge in Assam over the Bharali River and does not claim any pier height record.

Correct Answer: C. Son

• **Son River** = The Nehru Setu railway bridge is built over the Son River in Bihar, connecting Dehri-on-Son and Son Nagar on the Grand Chord route of Indian Railways. At 3.06 km in length, it is one of the longest railway bridges in India and was completed in 1900 during the British era as part of the East Indian Railway. • **Bridge details** — The Nehru Setu consists of 93 spans of steel lattice girders on stone masonry piers; it was originally called the 'Son Bridge' and was later renamed Nehru Setu in honour of India's first Prime Minister. The Son River is a major right-bank tributary of the Ganga. • The Nehru Setu carries the Howrah–Mumbai Grand Chord line, one of India's most important freight and passenger corridors; the bridge handles heavy coal traffic from the Damodar Valley coalfields moving westward to Mumbai and Gujarat. • 💡 Option A (Ganges) is wrong because the main rail bridge over the Ganga at the relevant location is the Rajendra Setu at Mokama, not the Nehru Setu; Option B (Yamuna) is wrong because railway bridges over the Yamuna are at Delhi, Agra, and Mathura — Nehru Setu is far from any Yamuna crossing; Option D (Godavari) is wrong because Godavari railway bridges are located in Andhra Pradesh at Rajahmundry, while Nehru Setu is in Bihar on the Son River.