# Grey Line (Namma Metro)

The Grey Line or Hosahalli-Kadabagere Line is an upcoming metro line serving Bangalore as part of the Namma Metro network in the city. This metro line will serve the industrial areas, manufacturing units, Engineering and Textile Manufacturing Units on Magadi Road, providing connectivity to the Westren part of the city, thereby improving last-mile connectivity to commercial centres, industrial hubs, educational institutions, and healthcare facilities. The line was approved by the Union Cabinet on August 17, 2024 and is scheduled for completion in 2029.

## History

BMRCL began planning Namma Metro Phase-III in 2013, shortly after announcing Phase-II, which included the Yellow Line and Pink Line. Later in June 2013 BMRCL partnered with RITED Limited to conduct a pre-feasibility study for each proposed corridor
By 2016, BMRCL submitted its Phase-III proposal to the Ministry of Urban Development, which initially spanned 150.94 km. However, following the feasibility the network size was reduced to 102 km, with the remaining corridors being planned for Light Rail. The proposed lines were
* Nagavara - Kempegowda International Airport
* Carmelaram - Yelahanka
* Marathahalli - Hosakerehalli
* Silkboard - Hebbal via KR Puram.
However, in 2017 the Karnataka Government announced that the Silkboard - Hebbal line and the Nagavara - Airport line were merged to create the Blue Line and fast tracked to Phase 2A and Phase 2B.
In 2018 the Karnataka Government officially confirmed Phase III with several modifications. Multiple new lines were introduced while some others were dropped. Following another round of modifications in 2020, only two lines were finalized to be part of Phase-III
* Magadi Road Toll Gate to Kadabagere line
* Kempapura to JP Nagara 4th Phase
In July 2020, RITES Limited was assigned to prepare the Detailed Project Report (DPR) work for Phase-III. RITES submitted the DPR to the State Government who approved it in November 2022. The final approval was received from the Central Government in August 2024 paving the way for BMRCL to start land acquisition and tender notification.

## Tendering

As of January 2025 BMRCL has issued tenders for Geotechnical Investigations and Detailed Design Consultancy (DDC). Once the Geotechnical Investigations are finished and finalized with the DDC BMRCL plans to release the Civil Work Tender.
Pre-Construction Activity :
| Tendering | Section | Activity | Successful Bid /Cost | Contractor | Award |
| Phase-3/GTI/2024/109/ Pkg-4 | Hosahalli to Kadabagere | Geotechnical Investiation | ₹1.54 crore (US$180,000) | SECON | 23 Jul 2024 |
| Phase-3/DDC3/RFP/2024/117 | Hosahalli Station to Kadabagere | Detailed Design Consultant | Bidding Underway | Bidding Underway | Bidding Underway |
| EPDD-5 | Traction and Power Supply | Detailed Design Consultant | Bidding Underway | Bidding Underway | Bidding Underway |
| Total | Total | Total | ₹1.54 crore (US$180,000) | | |

## Stations
### Interchanges

Passenger interchange facilities, connecting to other metro and railway lines, are proposed at the following stations:
* Hosahalli (Connects to the Purple Line, which runs from Whitefield (Kadugodi) to Challaghatta)
* Sumanahalli Cross (Connects to the Orange Line, which runs from JP Nagar 4th Phase and Kempapura)
Grey Line :
| # | Station Name | Station Name | Connections | Station Layout |
| # | English | Kannada | Connections | Station Layout |
| 1 | Hosahalli | ಹೊಸಹಳ್ಳಿ | Purple Line | Elevated |
| 2 | K H B Colony | ಕೆ ಎಚ್ ಬಿ ಕಾಲೋನಿ | | Elevated |
| 3 | Vinayaka Nagara | ವಿನಾಯಕ ನಗರ | | Elevated |
| 4 | Sumanahalli Cross | ಸುಮನಹಳ್ಳಿ ಕ್ರಾಸ್ | Orange Line | Elevated |
| 5 | Sunkadakatte | ಸುಂಕದಕಟ್ಟೆ | | Elevated |
| 6 | Herohalli | ಹೇರೋಹಳ್ಳಿ | | Elevated |
| 7 | Byadarahalli | ಬ್ಯಾಡರಹಳ್ಳಿ | | Elevated |
| 8 | Forest Gate | ಅರಣ್ಯ ದ್ವಾರ | | Elevated |
| 9 | Kadabagere | ಕಡಬಗೆರೆ | | Elevated |