According to ministry of Railways "The enhanced speed limits could be achieved due to the systematic and planned strengthening of track & its infrastructure by removing bottlenecks in these sections on a fast pace."
Railways has utilized the opportunity of the lockdown period and low train movement last year due to the COVID-19 pandemic to complete all necessary infrastructure up-gradation works. Based on these improvements done by the Zone, the RDSO/Lucknow conducted oscillation trials through Confirmatory Oscillograph Car Run (COCR) consisting of instrumented coaches of all classes at 130 Kmph speed during July and October last year. During this check, in addition to track parameters, other areas like signalling aspect, traction distribution equipment, locomotive coach fitness were also checked and recorded.
Following are routes where it enhanced:-
1. Golden Diagonal (Grand Trunk) Route: 744 Routes Km
i. Ballarshah to Kazipet – 234 Rkm
ii. Kazipet-Vijayawada-Gudur – 510 Rkm
2. Golden Quadrilateral Route (Chennai -Mumbai section): 536 Route Km
i. Renigunta to Gooty - 281 Rkm
ii. Gooty to Wadi - 255Rkm
The maximum speed limits in the High-Density Network (HDN) between Secunderabad – Kazipet (132 Kms distance) had been enhanced to 130 kmph.
As such, including both the Up and Down lines in these sections, a total of 2,824 kms (1412Rkms)has now been made fit to run at a speed of 130 kmph. This covers the entire GQ-GD route over SCR, except Vijayawada - Duvvada section, where signalling up-gradation work is in progress.