Subways

The idea for creating subways emerged in the 19th century, when people were tired of the overcrowded cities and a larger demand for fast travel. Today, they are one of the symbols for urban infrastructure that connects businesses, districts, or even cultural hubs. However, developing them requires specialised and precise knowledge of construction, such as different soil types, designing aspects, and safety procedures that ensure people are safe and comfortable while using these underground trains. 

This entry explores not only how subways influence a visitor’s experience, but also the planning and engineering behind their creation. It offers insight into how these underground train networks are built, the innovations shaping their future, and the ways they reflect the character and culture of the cities they serve.

What is the definition of a subway?

It is an underground electric railway system that transports a large number of passengers within the city. As discussed earlier, subways help passengers bypass traffic and provide a safer, more reliable journey than cars and buses. These underground trains run on interconnected tracks and tunnels. Planners place their stations close to key locations for easy access.

According to reports, the London underground saw a total of 1.18 billion passenger journeys in the year 2023-2024. Since its opening, the Elizabeth line has handled almost 550 million journeys in just three years. These numbers are a clear indication that people prefer to use the metro more than any other mode of transport. This is because they are no longer willing to waste their time just sitting in their cars for hours waiting for the traffic to clear.  Moreover, these train lines also fulfil the need of the hour by reducing the population, which makes them an important contributor to sustainable city planning. 

Step-by-step construction process of subways

Building subways is like assembling a giant underground Lego puzzle. Every piece must fit correctly so it does not fall apart early after construction. Moreover, engineers must follow a set building process, and they cannot jump steps because every level is properly planned to ensure safety, durability, and efficiency. 

If done well, these projects take years to complete. They require advanced engineering skills, strict safety measures, and precise coordination between teams. Here is a simple breakdown of each stage. Some examples will help explain the process further.

Planning and site investigation

Before digging any area, engineers spend months or even years studying the entire area. They check the soil quality to see if it is hard, soft, or a mix of both. Professionals also look for the environmental impact of the project on the wildlife, local people, and different resources. 

Route planners map the path for the subways. This helps decide tunnel depth and station locations for passenger convenience. This stage ensures the project can proceed with minimal disturbance to others.

Site preparation and Launch box creation

Once the team finalises the plans, they prepare the tunnelling start points. First, they clear the site of waste and obstacles. They also move utility pipes out of the way. Next, they dig a large open area called the launch box. Then, they lower the tunnel boring machine (TMB) into the launch box and assemble it carefully. This stage is very important because the TBMs cannot start anywhere without space and a support structure.

Tunnel excavation and Lining installation

This is the stage where the real underground work begins for subways. The TBMs cut through the soil and rock while installing concrete segments that form the tunnel walls. These walls are sealed with high-pressure coatings for more stability. 

Station construction and structural works

Underground stations are usually built using the cut-and-cover method. Workers dig out large spaces for the platforms and passenger areas and then strengthen the walls with steel and concrete. Other safety systems, such as ventilation shafts and emergency exits, are also installed at this stage. 

System installation and final tests

This is the final stage for building subways. Engineers install various communication, lighting, and signalling systems. Before opening to the public, the team tests the entire station system. They conduct trial runs, emergency drills, and safety inspections. Once the station passes all checks, it opens for passengers.

Future of subways in travel and tourism

Subways play a much bigger role in the way people travel for their daily commute and tourism. With the current rise in the population and increase in congestion and parking charges, these underground travel options are becoming a major attractive option. The government and the transport authorities are heavily investing in the daily upgrades, expansions, and installation of sustainable technology options. This is to ensure that every underground metro line remains fast, reliable, and eco-friendly. 

One of the biggest changes is the expansion of contactless and digital payments across the city and regional areas. This significantly reduces paper use and makes it easier for those without railcards to pay directly through smartphones and bank cards. Also, the UK government is working to reduce carbon emissions from subways by introducing regenerative braking systems, aligning with the country’s Net Zero 2050 goal.

Many new stations have step-free access. They also have clearer signs and features to help elderly passengers. These upgrades help tourists and residents reach more destinations faster. They reduce overcrowding on trains and at stations. The improved subway network makes daily travel easier and less stressful. People no longer worry about how to get to their destination. They don’t need to spend hours planning before they leave.