Blue Line (Delhi Metro)

Line 3 (Main Line): <a href="Noida_Electronic_City_metro_station" title="Noida Electronic City metro station">Noida Electronic City and Dwarka Sector 21
Line 4 (Branch): Vaishali and Yamuna Bank

Blue Line
(Line 3 & Line 4)
Blue Line; (Line 3 & Line 4)
	Fleet of Blue line manufactured by Mitsubishi-ROTEM
Overview
Status	Operational
Locale	Delhi, Noida
Termini	Line 3 (Main Line): Noida Electronic City and Dwarka Sector 21; Line 4 (Branch): Vaishali and Yamuna Bank;
Stations	Line 3 (Main Line): 50 ; Line 4 (Branch): 8
Service
Type	Rapid transit
System	Delhi Metro
Operator(s)	Delhi Metro Rail Corporation
History
Opened	Line 3 (Main Line): 31 December 2005,; Line 4 (Branch): 8 January 2010
Technical
Line length	Line 3 (Main Line): 56.11 km (34.87 mi),; Line 4 (Branch): 8.51 km (5.29 mi)
Character	At-grade, Underground, and Elevated
Track gauge	1,676 mm (5 ft 6 in) broad gauge
Electrification	25 kV 50 Hz AC overhead catenary
Route map
	Uttar Pradesh
	Delhi
	Nizamuddin Bridge over
	National Highway 24

The Blue Line (Line 3 & Line 4) is a metro rail line of the Delhi Metro, a rapid transit system in Delhi, India. It is the longest line (by total length) of the network and consists of a Main Line (Line 3) with 50 stations from Noida Electronic City to Dwarka Sector 21, with a length of 56.11 kilometres (34.87 miles) and a Branch Line (Line 4) consisting of 8 stations from Vaishali to Yamuna Bank, with a length of 8.51 kilometres (5.29 miles).

The Main line (Line 3) was the longest line of the Delhi Metro network until 6 August 2021, when an unfinished section between Mayur Vihar Pocket 1 and Trilokpuri Sanjay Lake stations on the Pink Line was inaugurated, becoming one 59-km-long corridor.

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