NEW DELHI (DELHI) TO CHENNAI (TAMIL NADU) : FULL TRAIN JOURNEY : 12622 CHENNAI CENTRAL - NEW DELHI TAMIL NADU SUPERFAST EXPRESS : ERODE WAP-7 LOCOMOTIVE : TRAIN RESCHEDULED BY 18 HOURS & MANY OVERTAKES ENROUTE

12622/Tamil Nadu Express (PT)
Other Names: TN
तमिलनाडु एक्सप्रेस
NDLS/New Delhi -- MAS/MGR Chennai Central

The 12621 / 12622 Tamil Nadu Express is a daily Superfast train of the Indian Railways. It is the fastest non AC train between New Delhi and Chennai covering the distance in 32 hours.
It only stops at Agra, Gwalior, Jhansi, Bhopal, Itarsi, Nagpur, Balharshah, Warangal, Khammam (since 09.10.2023) and Vijayawada.
It has the non stop continuous run between Vijayawada and Chennai Central of 431 km.
It is hauled by a WAP-7 from Royapuram / Erode shed end to end since the whole route is electrified.
Tamil Nadu Express has traditionally been accident-prone, with many accidents occurring due to its speed. The top speed of the train was reduced after series of derailments and after major derailment of 14 coaches on 31 August 1981 at Asifabad Road Station in Telangana, in which 15 persons were killed and 39 injured.

New Delhi railway station (station code: NDLS) is the main railway station of the Indian capital of New Delhi. Platform 1 is located at Paharganj and platform 16 opens up on to the side of Ajmeri Gate. The station is in Central Delhi, about two kilometres (1.2 mi) north of Connaught Place in New Delhi. It is one of the busiest railway stations in the country in terms of train frequency and passenger movement.
The station is the main junction for the Rajdhani Express and a number of pairs of Shatabdi Express originate and terminate at this station. In 1969 the first Rajdhani Express left from the station to Howrah. The first Vande Bharat Express was flagged off from the station in 2019. Luxury tourist trains have itinerary's which start and end at New Delhi railway station, Palace on Wheels, Royal Rajasthan on Wheels and Maharajas' Express. The Buddhist circuit train Mahaparinirvan Express also starts and end at the station. The number of trains per platform per day varies from 13 trains to 23 trains. On average the station handles 250+ trains every day, while the maximum handled in a day reaches 275. It handles around 400+ unique trains in total.
Rail lines include the New Delhi-Mumbai main line, Howrah-Gaya-Delhi line, both part of the Diamond Quadrilateral, and the New Delhi-Chennai main line; the lines have been improved in various ways over the years and there are plans to further improve it. The maximum sectional speed permissible on these lines in 2016 was 100–130 km/h (62–81 mph). The Delhi-Ahmedabad high-speed rail corridor, part of a larger modernisation push, is planned.

Chennai Central (officially Puratchi Thalaivar Dr. M.G. Ramachandran Central Railway Station, formerly Madras Central)(station code: MAS), is an NSG–1 category Indian railway station in Chennai railway division of Southern Railway zone. It is the main railway terminus in the city of Chennai, Tamil Nadu, India. It is the busiest railway station in South India and one of the most important hubs in the country. It is connected to Moore Market Complex railway station, Chennai Central metro station, Chennai Park railway station, and Chennai Park Town railway station. It is about 1.8 km (1.1 mi) from the Chennai Egmore railway station. The terminus connects the city to major cities of India, including Bangalore, Kolkata, Mumbai, and New Delhi, and different parts of India.
Chennai Central is a terminal station with bay platforms. The average length of railway tracks in the station is 600 metres. The entire complex has 17 platforms to handle long-distance trains with 5 platforms exclusively for suburban trains. The total length of the station is about 950 m. The main building has 12 platforms and handles long-distance trains. The complex for suburban trains is popularly known as the Moore Market complex. There is a platform 2A between platforms 2 and 3; it is used to handle short-length trains like the Chennai Rajadhani Express, Vijayawada Jan Shatabdi Express, Bengaluru Shatabdi Express, Mysuru Shatabdi Express and the Gudur Passenger. The 13-storied annexe building, the Moore Market Complex building, has 5 platforms and handles north- and westbound suburban trains.
Chennai Central used to have trains with special liveries until the early 1990s. The Brindavan Express used to have green livery with a yellow stripe running above and below the windows; Nilgiri Express (popularly known as the Blue Mountain Express) had blue livery. All trains now have the standard blue livery (denoting air-braked bogies). Notable exceptions include the Rajadhani, Shatabdi and the Jan Shatabdi expresses. The Sapthagiri Express, Tirupati Express has a vivid green/cream livery combination with a matching WAM4 6PE locomotive from Arakkonam (AJJ) electric locomotive shed.

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