List of high-speed railway lines in India
India currently does not have any High-speed rail lines operational, but has several lines planned, one of which is currently under construction. The following article lists all the lines in various stages of completion. Classification
The Indian Ministry of Railways has classified railway line speeds into five categories: 

Conventional lines: The routes which support an operational speed of less than  are conventional rail lines. Group B lines: The routes which support an operational speed between  are classified as Group B lines. Group A lines: The routes that support the speeds between  are classified as Group A lines. Semi-high speed lines: The routes that support speeds between  are considered as a higher speed or semi-high speed rail

High-speed lines: The routes that support speeds beyond semi-high speeds are considered as High-speed lines. Overview

300–350 km/h

Mumbai-Ahmedabad

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Mumbai–Ahmedabad high-speed rail corridor is the first of the twelve lines proposed and also the first one to be under-construction, it connects India's economic hub Mumbai with the city of Ahmedabad. Delhi-Varanasi

The Delhi-Varanasi High-Speed Rail Corridor is India's second bullet train project after the Mumbai-Ahmedabad Corridor. The  stretch will connect Varanasi to Delhi through 12 stations via Lucknow & Ayodhya. Delhi-Ahmedabad

Chennai-Mysuru

Mumbai-Nagpur

Mumbai-Hyderabad

Varanasi-Howrah

Hyderabad-Bengaluru

Nagpur-Varanasi

Delhi-Amritsar

Patna-Guwahati

Amritsar-Jammu

200–250 km/h

Ahmedabad-Rajkot (220 km/h)

Thiruvananthapuram-Kasargod (200 km/h)

Pune-Nashik (200 km/h)

Diamond quadrilateral 

Diamond quadrilateral is an ambitious plan from India to connect its major cities of New Delhi, Kolkata, Chennai and Mumbai via a high-speed rail network. Sections of this project are either already under construction or approved. See also
NHSRCL
Future of rail transport in India
Urban rail transit in India
Dedicated freight corridors in India
List of high-speed railway lines in China

References

External links
 Preliminary Study
 India's first bullet train project launched, by Respected PM Narendra Modi calls it New India's big dream
 OpenStreetMap with route of Mumbai–Ahmedabad high-speed rail corridor；Permanent link

High-speed rail in Asia
High-speed rail in Asia by country
High-speed rail in India
High-speed railway lines in India
Standard gauge railways in India
Proposed railway lines in India
India–Japan relations
2028 in rail transport