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,^[a] thereby improving last-mile connectivity to commercial centres, industrial hubs, educational institutions, and healthcare facilities.^[1][2] The line was approved by the Union Cabinet on August 17, 2024 and is scheduled for completion in 2029.^[3][4]

Grey Line
Overview
Other name(s)	Hosahalli-Kadabagere Line
Status	Approved
Owner	Bangalore Metro Rail Corporation Limited (BMRCL)
Locale	Bangalore, Karnataka, India
Termini	Hosahalli Kadabagere
Connecting lines	Operational (1): Purple Line Upcoming (1): Orange Line Planned (1): Inner Ring Line
Stations	11(Elevated)
Website	bmrc.co.in
Service
Type	Metro
System	Namma Metro
Depot(s)	Magadi Road (TBD)
History
Planned opening	2029; 4 years' time (2029)
Technical
Line length	42 km (26 mi)
Number of tracks	2
Character	Elevated (TBD)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Electrification	750 V DC third rail
Grey Line Map Legend Blue Line to Krishnarajapura or Central Silk Board Blue Line Kempapura Blue Line Under construction Blue Line Red Line Hebbala (Red Line - Proposed) Blue Line towards KIAL Terminals Red Line towards Sarjapura Nagashetty Halli BEL Circle Muthyalanagar Indian Railways Towards Tumakuru and Yesvantpur Jn Green Line Peenya Kanteerava Nagar Hosahalli Purple Line Freedom Fighter's Colony KHB Layout Prem Nagar Kamakshi Palya Sumanahalli Cross Anjana Nagar Nagarbhavi BDA Complex Sunkadakatte Depot (U/C) Papireddy Palya Herohalli Vinayaka Layout Byadarahalli Nagarbhavi Circle Indian Railways Towards Kengeri and KSR Bengaluru Kamath Layout Mysuru Road Purple Line Kadabagere Dwaraka Nagar Hosakerehalli Kamakhya Bus Depot Kadirenahalli Jaya Prakash Nagar Green Line JP Nagar 5th Phase JP Nagar 4th Phase Pink Line Under construction Legend: Kempapura ⇔ JP Nagar Phase 4 (Corridor-1) Sri Balagangadharanatha Swamiji Stn., Hosahalli ⇔ Kadabagere (Corridor-2)

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 Investigation	₹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
EPDD-5	Traction and Power Supply	Detailed Design Consultant	Bidding Underway
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		Connections	Station Layout
	English	Kannada
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

See also

• Namma Metro
  • Purple Line
  • Green Line
  • Yellow Line
  • Pink Line
  • Blue Line
  • Red Line
  • Aqua Line
  • List of Namma Metro Stations
• Rapid transit in India
• List of metro systems

Notes

1. Outer Ring Road West Side, Magadi Road with its neighbouring areas