Indian Railways to Build Four Tracks on Its Seven Busiest Corridors
Indian Railways plans to quadruple (build four parallel tracks on) its seven busiest corridors, covering about 11,000 km. The Union Cabinet approved four-laning of these seven high-density routes on 9 September 2026.
The seven corridors are Delhi-Howrah, Howrah-Chennai, Chennai-Mumbai, Mumbai-Delhi (the four sides of the "Golden Quadrilateral"), the diagonals Delhi-Chennai and Mumbai-Howrah, and Delhi-Guwahati.
These routes make up only about 16% of the rail network but carry about 41% of its traffic. Many sections already run more trains than they were designed for.
The main pressure comes from heavy freight, especially coal for power plants, and from rising passenger numbers. Extra tracks will let freight and passenger trains run separately, and the railways expect to add over 1,000 more trains once the capacity is ready.
Reports put the cost of multi-tracking these corridors at about ₹4.2 lakh crore. On the same day in September, the Cabinet also approved eight multitracking projects of about 1,196 km worth about ₹20,804 crore.
Railway Multitracking: Doubling, Tripling and Quadrupling of Lines
Railway multitracking means laying extra tracks next to an existing railway line, so that more trains can run on the same route. Going from one track to two is called doubling. Adding a third or fourth line is called tripling or quadrupling. Multitracking does not create a new route; it increases the capacity of a route that already exists. It is the main way Indian Railways deals with crowded lines.
The plan to quadruple all seven HDN routes is multitracking at its largest scale. With four lines on these 11,000 km, coal and other freight can run on one pair of tracks and passenger trains on the other. This is what will make room for the extra 1,000-plus trains the railways expect to add.
Dedicated Freight Corridors (DFC)
Dedicated Freight Corridors (DFCs) are railway lines built only for goods trains. No passenger trains run on them. Because goods trains no longer have to wait for passenger trains, they can run faster, longer and heavier, and carry much more cargo. India's first two DFCs, the Eastern and the Western, together cover about 2,843 km.
The DFCs have already moved a large share of goods trains off the busiest routes, especially on the Delhi-Howrah and Delhi-Mumbai corridors. Quadrupling the seven HDN routes works alongside them: together, freight-only lines and extra tracks give the railways enough room for heavy coal traffic and more passenger trains.
National Rail Plan (NRP) 2030
The National Rail Plan is Indian Railways' long-term master plan. Its main idea is to build enough capacity by 2030 to meet traffic demand up to 2050, so that capacity stays ahead of demand. Its headline goal is to raise the railways' share of India's freight to 45% by 2030. It lists the corridors that need new lines, extra tracks and freight corridors.
Quadrupling the seven busiest corridors carries forward the NRP's main recommendation: clear the most congested routes first. The plan's 45% freight target depends on making room on these lines for faster, more reliable goods trains.
- Corridors to be quadrupled: 7 high-density routes, about 11,000 km
- Share of network: about 16% of route length; share of traffic: about 41%
- Cabinet approval of four-laning the seven HDN routes: 9 September 2026
- Estimated cost of multi-tracking: about ₹4.2 lakh crore (reported)
- Same-day approval: 8 multitracking projects, about 1,196 km, about ₹20,804 crore
- Expected addition: over 1,000 trains
- Average freight train speed on existing network: about 25 km per hour
- Dedicated Freight Corridors: Eastern 1,337 km and Western 1,506 km (total about 2,843 km)
- National Rail Plan target: 45% rail share of freight by 2030