Howrah–Chennai main line
Howrah–Chennai railway route
Overview
Status	Operational
Owner	Indian Railways
Locale	West Bengal,Odisha, Andhra Pradesh,Tamil Nadu
Termini	Howrah Puratchi Thalaivar Dr. M.G. Ramachandran Central Railway Station
Service
Operator(s)	South Eastern Railway,East Coast Railway,South Central Railway,Southern Railway
History
Opened	1901
Technical
Line length	1,661 km (1,032 mi)
Number of tracks	2
Track gauge	5 ft 6 in (1,676 mm)broad gauge
Electrification	2005 with 25 kV overhead line
Operating speed	up to 130 km/h
Route map Legend km 0 Howrah 116 Kharagpur toAdra to Howrah–Nagpur– Mumbai line Kharagpur–Puri line West Bengal Odisha border 231 Balasore 294 Bhadrak 337 Jajpur Keonjhar Road Mahanadi 409 Cuttack 437 Bhubaneswar 456 Khurda Road toPuri Khurda Road– Visakhapatnam section 527 Balugaon 582 Chatrapur 603 Brahmapur Odisha Andhra Pradesh border 603 Ichchapuram 645 Sompeta 678 Palasa 703 Naupada 751 Srikakulam Road 789 Chipurupalle to Jharsuguda– Vizianagaram line 820 Vizianagaram 881 Visakhapatnam Junction Duvvada– Vijayawada section 914 Anakapalle 977 Tuni 994 Annvaram 1,031 Samalkot 1,081 Rajahmundry Godavari River 1,103 Nidadavolu 1,123 Tadepalligudem 1,170 Eluru to Kazipet– Vijayawada section 1,230 Vijayawada Junction to Vijayawada–Nidadavolu loop line Krishna River Vijayawada– Gudur section toGuntur–Tenali section 1,230 Tenali to Tenali–Repalle branch line 1,304 Bapatla 1,319 Chirala 1,369 Ongole 1,485 Nellore 1,523 Gudur Gudur–Chennai section Andhra Pradesh Tamil Nadu border 1,661 Chennai Central km Sources: Google maps Howrah Chennai SF Mail 12839

TheHowrah–Chennai main line is a railway line connectingChennai andKolkata cutting acrossEastern Coastal Plains of India. It covers a distance of 1,661 kilometres (1,032 mi) across,West Bengal,Odisha,Andhra Pradesh andTamil Nadu.

The 1,661 km (1,032 mi) long trunk line has been treated in more detail in its sections:

1. Howrah–Kharagapur section (approximately 115 km (71 mi)
2. Kharagpur–Khurda Road section (approximately 363.1 km (225.6 mi)
3. Khurda Road–Visakhapatnam section (approximately 430 km (270 mi))
4. Nidadavole–Narsapuram section
5. Duvvada–Vijayawada section (approximately 350 km (220 mi)) (fromAnakapalle south)South Coast Railway zone
6. Vijayawada–Gudur section (approximately 310 km (190 mi))South Coast Railway zone
7. Gudur–Chennai section (approximately 140 km (87 mi)) (exceptGudur Junction)Southern Railway zone

The Howrah–Chennai main line traverses theEastern Coastal Plains crossing such major rivers as theMahanadi,Godavari andKrishna. The coastal plains lying between theEastern Ghats and theBay of Bengal are fertile agricultural lands with high density of population.^[1][2]

TheHowrah–Delhi main line was the first trunk route in India connecting two metropolises. It was opened in 1866.^[3] The second trunk route wasHowrah–Prayagraj–Mumbai line, opened in 1870.^[4] TheHowrah–Nagpur–Mumbai line was opened in 1900 as the third trunk route in the country. Close on its heels was the Howrah–Madras main line in 1901.^[5]

The first train service in southern India was operated fromRoyapuram/Vyasarpadi Jeeva inChennai toWalajah Road, nearVellore, covering around 100 km (62 mi) long, and operated by Madras Railway Company, on 1 July 1856. Several other lines were also developed.^[3] During the period 1893 to 1896, 1,287 km (800 mi) of theEast Coast State Railway, fromVijayawada Junction toCuttack was built and opened to traffic,^[5][6] and construction of the Vijayawada–Madras link in 1899 enabled the through running of trains along the eastern coast of India.^[4]Bengal Nagpur Railway was working on both the Howrah–Kharagpur and Kharagpur–Cuttack lines, completed the bridge over theRupnarayan in 1900 and theMahanadi in 1901, thus completing the through connection between Chennai and Kolkata.^[5]

The southern part of the East Coast State Railway (from Waltair to Vijayawada) was taken over by Madras Railway in 1901.^[7] The 514 km (319 mi) long northern portion of the East Coast line to Cuttack, including the branch line toPuri, was taken over byBengal Nagpur Railway in 1902.^[6][8]

In 1908 Madras Railway was merged with the Southern Mahratta Railway to formMadras and Southern Mahratta Railway.^[9][10]

In the early 1950s legislation was passed authorizing the central government to take over independent railway systems that were there. On 14 April 1951 theMadras and Southern Mahratta Railway, theSouth Indian Railway Company and Mysore State Railway were merged to formSouthern Railway. Subsequently,Nizam's Guaranteed State Railway was also merged into Southern Railway. On 2 October 1966, the Secunderabad, Solapur, Hubli and Vijayawada Divisions, covering the former territories of Nizam's Guaranteed State Railway and certain portions of Madras and Southern Mahratta Railway were separated from Southern Railway to form theSouth Central Railway. In 1977, Guntakal division of Southern Railway was transferred to South Central Railway and the Solapur division transferred to Central Railway. Amongst the seven new zones created in 2010 wasSouth Western Railway, which was carved out of Southern Railway.^[11]

TheBengal Nagpur Railway was nationalized in 1944.^[7]Eastern Railway was formed on 14 April 1952 with the portion ofEast Indian Railway Company east ofMughalsarai and the Bengal Nagpur Railway.^[12] In 1955,South Eastern Railway was carved out of Eastern Railway. It comprised lines mostly operated by BNR earlier.^[12][13] Amongst the new zones started in April 2003 wereEast Coast Railway andSouth East Central Railway. Both these railways were carved out of South Eastern Railway.^[12] Amongst the new zone to be started in April 2020 isSouth Coast Railway this railway was carved out of South Central Railway and East Coast Railway.^[12]

The line was the site of one of India's worst rail disasters, the2023 Odisha train collision.

Howrah–Chennai Mail was the first train in South Eastern Railway to be hauled by a diesel engine (WDM-1) in 1965.^[13]

The Howrah–Chennai route was completely electrified by 2005.^[14]

The New Delhi –Chennai Central line of which the Vijayawada–Chennai section is a part, and Howrah–Nagpur–Mumbai line, of which the Howrah–Kharagpur section is a part, are planned to be upgraded as "Group A" lines which can take speeds up to 160 km/h. The Kharagpur-Vijayawada sector is classified as aGroup B line which can take speeds up to 130 km/h.^[15]

The main passenger train services along this line are theHowrah–Chennai Mail and theCoromandel Express.Howrah,Kharagpur,Balasore,Cuttack,Bhubaneswar,Brahmapur,Vizianagaram,Visakhapatnam,Rajahmundry,Eluru,Vijayawada,Nellore,Ongole ,Gudur andChennai Central on this line are amongst the top hundred booking stations of Indian Railway.^[16]

The Howrah–Chennai main line is a part of the golden quadrilateral. The routes connecting the four major metropolises (New Delhi, Mumbai, Chennai and Kolkata), along with their diagonals, known as the golden quadrilateral, carry about half the freight and nearly half the passenger traffic, although they form only 16 per cent of the length.^[17]

• 5 ft 6 in gauge railways in India
• Main railway lines of India
• Rail transport in West Bengal
• Rail transport in Odisha
• Rail transport in Andhra Pradesh
• Rail transport in Tamil Nadu

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