Chennai Arakkonam AC Suburban Train Trials Begin September 2025

Southern Railway is testing new AC suburban trains on the Chennai-Arakkonam route. This is part of a plan to introduce more AC trains, with a second unit expected by September 2025.
By Newsroom | Transport, Chennai |

Southern Railway Conducts Test Runs, Second AC Train Expected Soon

Southern Railway has initiated trial runs for air-conditioned suburban train services on the Chennai-Arakkonam section. A test run was recently completed between the railway shed in Avadi and Arakkonam railway station, signaling the imminent introduction of AC coaches on this commuter line. Officials stated that the AC trains are expected to operate at a minimum speed of 90 km/h.

Southern Railway conducts trial run of AC suburban train on Chennai-Arakkonam section - 1

The introduction of AC suburban trains in Chennai, a long-standing demand from commuters, appears to be inching forward with these recent test runs. However, the journey to widespread adoption and effective utilization of these services remains complex, marked by concerns over fares, infrastructure compatibility, and actual passenger uptake.

Southern Railway conducts trial run of AC suburban train on Chennai-Arakkonam section - 2

Infrastructure and Operational Adjustments

The new AC suburban trains are being designed as 12-coach units. This length poses operational challenges on certain existing routes, particularly the Beach-Velachery MRTS route, where some station platforms are built to accommodate shorter, nine-coach formations. This incompatibility means the AC trains cannot be deployed on that specific stretch.

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"Southern Railway is examining whether the new 12-coach unit should serve the Chennai Central–Arakkonam line or the Gummidipoondi section, with the final choice depending on schedule flexibility and infrastructure readiness."

Ridership and Fare Concerns

Previous experiences with Chennai's first AC suburban train service on the Beach–Tambaram–Chengalpattu section highlight a significant gap between capacity and actual ridership. Reports indicate that this existing AC train serves only around 2,800 daily travellers, a fraction of its potential to carry over 40,000 passengers.

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Transport observers suggest that elevated ticket charges are a primary deterrent for commuters. They point out that AC suburban fares are considerably higher—reportedly up to three times that of non-AC coaches—and may even approach metro-level pricing. Commuters argue that metro services, despite similar or higher costs, offer superior amenities, reliability, and convenience.

"Transport observers argue that aligning AC suburban fares with metro-level pricing could encourage more passengers to shift to rail, helping improve ridership while easing road congestion across the city."

Background: Gradual Introduction and Adaptation

Chennai's railway network is seeing a gradual rollout of AC suburban services. The first AC EMU train, built at the Integral Coach Factory (ICF) in Perambur, was slated for introduction around February 2025. While the Chennai Central–Arakkonam route is now being tested, initial plans indicated the AC rake would operate on sections including Beach-Chengalpattu via Tambaram, Moore Market complex-Avadi, and Arakkonam and Gummidipoondi.

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The initial AC EMU on the Beach–Chengalpattu route faced criticism regarding its timings upon inauguration. Fares, which initially started at Rs 35 for 10 km and went up to Rs 105 for longer distances, were reportedly adjusted following passenger feedback. The introduction of a second AC EMU unit, expected around late September 2025, is now being prioritized for the Chennai Central to Arakkonam route. This move follows the pattern of Mumbai, which launched India's first AC suburban train service in 2017 and currently operates the highest number of such services in the country.

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Frequently Asked Questions

Q: When will the new AC suburban trains start running on the Chennai-Arakkonam route?
Southern Railway is currently doing test runs for AC suburban trains on the Chennai-Arakkonam section. A second AC train is expected to start running by late September 2025.
Q: How fast will the new AC suburban trains travel in Chennai?
The AC suburban trains are planned to run at a minimum speed of 90 km/h. This is part of the ongoing trials on the Chennai-Arakkonam railway line.
Q: Why can't the new AC suburban trains run on the Beach-Velachery MRTS line in Chennai?
The new AC trains are 12 coaches long, but some platforms on the Beach-Velachery MRTS route are too short for them. This means the AC trains cannot be used on that specific line.
Q: Are the AC suburban train fares in Chennai very high?
Yes, the fares for AC suburban trains are much higher than normal trains, reportedly up to three times more. Some people think the prices are too high for daily commuters.
Q: How many people use the current AC suburban train in Chennai?
The first AC suburban train on the Beach-Tambaram-Chengalpattu route carries only about 2,800 passengers daily. This is much less than its capacity to carry over 40,000 people.
Q: When was the first AC suburban train in Chennai made?
The first AC EMU train was built at the Integral Coach Factory (ICF) in Perambur. It was planned to start running around February 2025.