City: Kolkata (India).
Track length: 6.1 km.
Track gauge: 1435 mm (standard gauge).
Closed.
Tram line: 5, 11, 18, 24, 24/29, 24/36, 25, 29 and 36.
Extra line: 30.
Tram line: 1, 1/11, 1/17, 2, 2/13, 3, 4, 6, 7, 7/12, 8, 8/12, 9, 10, 12, 12/15, 12/20, 12/32, 12/7, 12A, 12A/32, 12B, 13, 14, 15, 15/20, 16, 17, 19, 20, 21, 22, 24/37, 26, 30/36, 31, 32, 37, 40, 41 and 42.
Extra line: 12/1, 15/12, 20/17, 26/17 and 36/8.
West Bengal Transport Corporation (WBTC)
Ashis Mitra (April 25, 2020)
The route on google map you are pointing is not route 21, it is route 20, please correct it.
Photos from West Bengal Transport Corporation (WBTC)
Line: Kolkata tram line 17
Links about trams in Kolkata
Company: West Bengal Transport Corporation (WBTC)