Mumbai locals to get 238 new AC trains designed for extreme crush load

Vilas Wadekar, chairman and managing director, MRVC. File pic

Global bids have poured in for 238 cutting-edge 130 kmph air-conditioned (AC) trainsets custom-built for Mumbai's super dense crush load (SDCL) and coastal travel (20.32T axle load). Resolving over 2000-plus queries from bidders on speed, HVAC (heating, ventilation, and air conditioning), safety, and 35-year ops, the tender is set to be finalised by June.

The suburban network manages a super dense crush load that, in terms of sheer weight and frequency, is more comparable to heavy-haul freight operations than standard urban transit. FILE PIC/ASHISH RAJE

The Mumbai Railway Vikas Corporation (MRVC), which is working on one of its biggest tenders, worth R19,293 crore, for these trains, is working day and night to set things. MRVC Chairman and Managing Director Vilas Wadekar, in an exclusive chat with mid-day, shed light on the heavy-duty local train project.

Excerpts:

Is there any delay in the processing of the new 238 AC local tenders?
Absolutely not. The response has been exceptionally encouraging, with global industry leaders engaging deeply. This is one of the world's largest and most technologically advanced rolling stock procurements, involving 238 state-of-the-art AC trainsets. The unique nature of this rolling stock is defined by a rare combination of technical extremes: a high-speed capability, the ability to withstand Mumbai's harsh coastal environment, and the structural integrity to support SDCL within a 20.32 tonne axle load limit. A trainset engineered to perform reliably under such a specific operational parameter is truly a global first in railway design.

How is it being handled?
Given the scale of the project and the complex 35-year maintenance lifecycle, we have prioritised response to stakeholders' queries for clarity on technical specifications and contract conditions. We have successfully addressed nearly 2000 detailed technical and techno-legal queries from global industries across two pre-bid conferences. This rigorous consultative process ensures a robust contract and transparency for all stakeholders. The tender is moving forward with high momentum toward the scheduled opening, ensuring that Mumbai receives a world-class, future-proof urban mobility solution.

What kind of queries?
There are wide-ranging queries, specifically technical, commercial, and legal, pertaining to every system and subsystem of the train. Since we have envisaged significant improvements over the existing fleet, the industry has sought deep clarity on our higher performance benchmarks.

These include the transition to a 130 kmph operating speed, enhanced acceleration and deceleration, which are critical to compensating for station dwell times and maintaining a high-frequency timetable. Queries also focus on the higher-capacity HVAC systems designed for Mumbai's extreme passenger density, safety features, energy-efficiency targets and unique design tweaks like the complete segregation of luggage compartments to ensure odour-free air circulation in passenger areas.

Because the successful technology partner is not merely a supplier of trainsets but a long-term stakeholder building an ecosystem for 35 years, these clarifications are essential to delivering a technically flawless, world-class trainset that is custom-built for Mumbai's unique environmental and load requirements.

Are we looking at any global comparisons?
While we continuously benchmark against global best practices, the truth is that Mumbai's suburban network operates under conditions that are unique in the global railway landscape. Most international systems are designed for significantly lower passenger densities and different environmental stressors. In Mumbai, we manage an SDCL that, in terms of sheer weight and frequency, is more comparable to heavy-haul freight operations than standard urban transit.

Because global railways operate under vastly different environmental and operational parameters, a ‘one-size-fits-all' international product simply will not suffice. We are engaged in intense, bespoke planning to customise every aspect of these 238 trainsets. We aren't just procuring trains, we are engineering a specific solution for Mumbai's peculiarities to ensure the highest levels of safety, comfort, and reliability.

What about the sitting?
We have studied all global seating configurations in great detail, including longitudinal (Metro-style), transverse (across-track) and the Japanese ‘flexible bay' concepts. Beyond theoretical research, we also factored in some field trials and commuter feedback from the Mumbai network. Our simulations and trials revealed a critical trade-off: while alternative layouts might seem modern, they often result in a 20 per cent reduction in total seating capacity, which is unacceptable given our SDCLs and longer distance travel. To ensure we maximise space without compromising passenger comfort or seating availability, we have decided to retain the existing lateral seating arrangement. This configuration has proven to be the most efficient ‘best-case scenario' for Mumbai, allowing for the highest possible passenger throughput while maintaining the seating capacity that our commuters value.

Are the new AC trains all 12-car?
While the standard rake formation is of 12-cars, we have designed the new rolling stock with the flexibility to be configured as 12-car, 15-car or 18-car rakes. Our current focus is significantly increasing the number of 15-car services to immediately boost carrying capacity, and suburban infrastructure is being upgraded simultaneously to support these longer formations.

To manage longer rake formation, we are implementing a highly advanced Train Control & Monitoring System (TCMS). As the ‘brain' of the train, this computer-based platform allows for seamless reconfiguration of the rakes while coordinating vital subsystems like propulsion, braking, control, and doors, etc. This ensures that as Central and Western Railways complete their platform extensions and power supply upgrades for 15 and 18-car operations, our new 130 kmph fleet will be ready to deploy in the most high-capacity configuration required.