TRACK WORK

The Hyderabad Metro Rail network uses state-of-the-art track infrastructure designed for durability, ride comfort, and minimal maintenance.

Main Line Track

The main line is equipped with UIC 60 rails (Grade 1080, head-hardened) to ensure high strength and longer service life.
Rails are continuously welded using Flash Butt Welding and Alumino Thermic Welding to provide a smooth, joint-free track.
The track is laid as plinth-type ballastless track, with M-35 grade concrete plinths and ballastless rail fastenings spaced at 650 mm center-to-center on viaducts and ramps.
A 1 in 20 rail inclination is maintained for better stability and reduced wear.
Restraining rails (33 C1, Grade 880) are installed on all curves with radii less than 190 m to enhance safety and guidance.

Depots use UIC 60 rails (Grade 880) laid on standard gauge monoblock PSC sleepers with a density of 1,540 sleepers per kilometer.
Tracks are supported by 65 mm stone ballast with a minimum cushion of 250 mm (300 mm on the test track).
Sections of depot track are also laid as embedded track or plinth track with ballastless fastenings for special operational requirements.

All turnouts are designed with 1 in 20 rail inclination.
The main line uses 1 in 9 switches with radii of 300 m and 190 m, while depots use 1 in 7 switches with a 190 m radius, all built to the Zu 60 thick web profile.
Weldable CMS crossings, treated by explosive depth hardening to achieve a minimum hardness of 340 HBW, are used for enhanced durability.

Friction-type buffer stops are installed at the end of all tracks — including main lines, washing lines, stabling lines, workshop lines, and inspection bays — to provide an additional safety margin.

SN.	CRITERIA	DIMENSION
1.	Gauge	1435 mm
2.	Design speed Max. operating speed	90 Kmph 80 Kmph
3.	Max. axle load, loaded condition	17 tonne
4.	Maximum Gradient Normal / desirable Limit Exceptional Limit	2.5% 4%
5.	Sharpest vertical curve radius Sharpest horizontal curve radius	1500m 120 m (main line track) 90 m (depot track
6.	Traction power collection	Overhead Catenary system (OCS) at 25kV(AC) Rails shall be used for traction return current.
7.	Inclination of Rail	1 in 40
8.	Wheel tread profile	UIC 510-2 (S1002); to be interfaced with Rolling Stock Contractor.
9.	Rail profile	UIC 60 (861-3)