CHENNAI METRO RAIL SOURCES SAID THE EXISTING 45-KM CORRIDOR OF METRO RAIL WHERE WORKS WERE ON AND CONTRACTS AWARDED WOULD BE COMPLETED AS PER SCHEDULE. THE REMAINING CORRIDORS, WHERE METRO WAS SUPPOSED TO HAVE BEEN BUILT, MAY BE CONVERTED INTO MONORAIL ROUTES.
COST: MONO | Rs 45 crore to Rs 50 crore per km – METRO |Nearly Rs 300 crore per km of underground line
WEIGHT: MONO | A coach weighs six to 10 tonnes – METRO | A coach weighs 45 tonnes
RADIUS OF CURVATURE: MONO | Has lowest radius of 20 to 30 metres and can negotiate sharp curves of 90 degrees with ease – METRO | Radius is much more because trains run on standard gauge
CAPACITY: MONO | Only 10,000 commuters per hour – METRO | Can carry 30,000 commuters per hour
POWER DEMAND: MONO | Generates own power and does not require power from the grid. Source of power is combination of battery, solar, CNG genset and series of regenerative braking motors attached to wheel sets – METRO | Will require 25KV power which will be drawn through overhead power cable. Around 70MW will be used for two corridors
LAND NEEDED: MONO | Land requirement is less. Network can be built along medians and dividers and stations can be accessed from staircases or elevators that can be built on vacant land on the footpath or along the road – METRO | Land requirement is huge. Lines can be constructed along medians but stations are huge complexes that will straddle the entire width of the road. Chennai Metro Rail has minimised land requirement by positioning the line and stations mostly on government land
COMPLETION TIME: MONO | Can be installed and commissioned in 24 months – METRO | A 23-km corridor can be laid out in only four years.
Govt Plans 111-km Monorail Network In City. Metro Rail Phase-1 Work On, But Expansion Put On Hold. The state government has decided that monorail and not metro rail is best suited to solve the growing traffic woes in the city and has planned a comprehensive network to decongest it.
Though opinions differ over what is the best mode of mass rapid transit system for the city, those in favour of monorail say it is the best for a city with narrow roads and which requires a quick solution for its mounting traffic problems.
Monorail, those in favour of it say, is not cost intensive and can be constructed in six months. It involves rubber-tyred trains running on a horizontal concrete beam. Once implemented, Chennai will have a monorail network similar to those in cities in the US, Australia, Japan, China and Malaysia.
Though Chennai Mono Rail can only carry 10,000 commuters an hour against the metro’s capacity of 30,000 an hour, Frazer Nash, a monorail firm that did a study, says monorail’s capacity can be increased by operating more trains at intervals of 1.55 minutes.
Chennai Metro Rail sources said the existing 45-km corridor of metro rail where works were on and contracts awarded would be completed as per schedule. The remaining corridors, where metro was supposed to have been built, may be converted into monorail routes, they said.
Two corridors of metro rail are under construction—Washermenpet to airport via Anna Salai and Chennai Central to St Thomas Mount via Poonamallee High Road and 100 Feet Road—in phase one.
The previous government had approved three more lines—M o o l a k a d a i – T i r u m a n g a l a m , Moolakadai-Tiruvanmiyur and Luz-Poonamallee via Iyyappanthangal—for construction under phase two of the project.
As Chennai Metro rail hadn’t commenced feasibility studies for the new lines, the state government would take a decision on whether metro rail should be constructed on these routes, the sources said. The state government has announced plans to introduce monorail across Chennai to reduce traffic congestion and to increase the share of public transport in the urban transport network. The aim is to increase the share of public transport in Chennai from 27% to 46% by 2026.
This heralds a marked difference in the policy over the type of mass rapid transit system to be implemented in the city. The previous DMK government preferred metro rail and planned to implement it in phases across the city.
The announcement on Friday by the governor shows the new government will revive a monorail project that was supposed to have been implemented six years ago. In 2006, the AIADMK government headed by Jayalalithaa scrapped a proposal for a metro rail and tried to introduce monorail. Studies were conducted to lay a 300-km network with Parrys as the hub.
Bids were invited but the project was stalled because a court ordered that bids should not be awarded without its permission after a public interest litigation was filed against the project. Some of the routes considered for the monorail network were Parrys to Kelambakkam, Guduvancherry via airport, Kundrathur, Tirunindravur, Minjur, Karanai and others. A couple of feeder routes criss-crossing the city along narrow lanes were also proposed to connect with the main monorail lines.
Source – Times Of India