Kolkata Metro

The Kolkata Metro is a fast train system.

It helps people move around the city. It was the first of its kind in South Asia.

There are five lines with different colors.

Some tracks go under the ground. Other tracks stay above the ground.

Some trains even go under a river. This makes the trip very fast.

One station is very deep in the ground. Another station is very large. These are special places in India.

Many people use these trains every day. They help make the busy streets better. It is a great way to travel.

The Kolkata Metro is a fast train system in India.

It helps people travel through the city of Kolkata. This was the first rapid transit system in South Asia. It first opened in 1984.

The system has five lines with different colors.

Some tracks go under the ground. Other tracks stay above the ground. Some tracks are even under the Hooghly River.

Building the metro was a big job. It took many years to finish. Workers used different ways to make the tunnels. They used a method called shield tunneling. This uses a large machine to dig through the earth. They also used a method called cut and cover. This means they dug a trench and then covered it up.

There are 58 stations in the system. Some stations are very special. The Howrah station is the deepest station in India. The Jai Hind station is one of the largest in Asia. About 300 train trips happen every day. This helps many people move quickly through the city.

The Kolkata Metro is a fast train system in India.

It serves the city of Kolkata and its surrounding areas. This system is very special because it was the first rapid transit system in South Asia. It helps many people travel quickly through a busy region. Today, it is the fourth largest and fourth busiest metro system in India.

The metro is owned and run by Metro Railway, Kolkata. This group is a part of the Indian Railways. It is the only metro in the country controlled entirely by the Indian Railways.

The metro works using five different color-coded lines.

These lines use different types of tracks to move trains. Some tracks are broad-gauge and others are standard-gauge. The trains get their power from a 750 V DC third rail system. This means a special rail provides electricity to the trains. Some stations are underground, some are at ground level, and some are elevated. This variety helps the trains reach many different parts of the city.

Planning for this system started a very long time ago.

In 1919, a committee suggested a metro line for the city. They wanted to connect Bagmari to Salkia using a tunnel. However, the plan did not happen in 1923 because there was not enough money. Later, leaders like Bidhan Chandra Roy thought about underground railways again. In 1971, experts from the Soviet Union and East Germany helped make a master plan. Construction finally began in the early 1970s under Prime Minister Indira Gandhi.

Building the tunnels was a very hard job for the workers.

They used a method called cut and cover to build some parts. This means they dug a trench and then covered it up. For other parts, they used shield tunneling. This uses a large machine to dig through the earth. They even used compressed air and airlocks to dig in some areas.

Because this was a new process for India, it took 23 years to finish the underground railway.

The system has grown a lot since it first opened in 1984.

There are now 58 operational stations across the lines. The Green Line has a station called Howrah that is the deepest in India. The Yellow Line has the Jai Hind station, which is one of the largest in Asia.

Trains run every day between 06:30 and 22:44. About 300 daily train trips carry many passengers through the city. It is a huge part of how people move every day.

The Kolkata Metro is a major rapid transit system in West Bengal, India.

It serves the city of Kolkata and the wider Kolkata Metropolitan Region. This system holds historical importance as the first rapid transit system in South Asia. Today, it ranks as India's fourth largest and fourth busiest metro rail system. The network is owned and operated by Metro Railway, Kolkata. This organization is the 17th zone of the Indian Railways. It is unique because it is the only metro system in India controlled entirely by the Indian Railways.

The system operates using five color-coded lines.

These lines consist of underground, at-grade, and elevated stations. The tracks use both broad-gauge and standard-gauge measurements. To move the trains, the system uses a 750 V DC third rail system. This means electricity is provided through a third rail on the track. The metro serves 58 operational stations across a total length of 73.42 kilometers. Trains run daily between 06:30 and 22:44 IST. Approximately 300 daily train trips carry a vast number of passengers through the region.

Building the metro required complex engineering methods.

For much of the Blue Line, workers used the cut-and-cover method. This involves digging a trench and then covering it to create a tunnel. In other areas, such as a 1.09 km stretch near Shyambazar, they used shield tunneling. This process used compressed air and airlocks to manage the environment. This specific section crossed a railway yard and the Circular Canal. Because this was an indigenous, trial-and-error process, construction took nearly 23 years.

The history of the metro began long before the first train ran. In 1919, a committee led by W. E. Crum recommended a metro line. This plan would have connected Bagmari to Salkia via a tunnel under the Hooghly River. However, the proposal was not undertaken in 1923 due to a lack of funds. Later, in 1971, the Metropolitan Transport Project prepared a master plan. This plan used help from Soviet specialists and East German engineers. They proposed five rapid-transit lines for the city. Construction finally began after Prime Minister Indira Gandhi laid the foundation stone in 1972.

The Green Line, also known as the East–West Corridor, includes impressive engineering feats. This line includes the Howrah metro station. This station is the deepest metro station in India, reaching a depth of 35 meters. At its inauguration, it was also the largest metro station in the country. The Green Line also features an underwater tunnel segment. This was a major part of the plan to connect Bidhannagar to Howrah. Construction for this line began in March 2009 under the Kolkata Metro Rail Corporation.

As the system expands, new lines and stations are being added.

The Purple Line, or the Joka–Eden Gardens Corridor, opened in 2022. The Orange Line, running from Kavi Subhash to Beleghata, opened in 2024. The Yellow Line, connecting Noapara to Jai Hind, opened in 2025.

The Jai Hind station on the Yellow Line is significant. In August 2025, it became the largest metro station in India. It is also recognized as one of the largest metro stations in all of Asia. These new lines help connect more parts of the metropolitan area.

Connecting different lines is essential for a large transit network. The system uses interchange stations to help passengers switch between lines. For example, Noapara serves as an interchange for the Blue Line, Yellow Line, and Orange Line. Kavi Subhash also acts as an interchange for the Blue and Orange lines. The Esplanade station was upgraded to include a subway. This allows passengers to move between the Green Line, Purple Line, and Blue Line. Other interchanges exist at Salt Lake Sector-V and Jai Hind. These connections allow the metro to function as a single, integrated system.