Why in news?
On 23 December 2025, the Alipurduar Division of North‑east Frontier Railway set a record by renewing 1,033 metres of track in a single day using the Plasser’s Quick Relaying System (PQRS). The mechanised system allows rail panels to be removed and replaced quickly, reducing disruption to train services.
Background
PQRS is a semi‑mechanised track renewal method developed by the Austrian company Plasser & Theurer. It uses self‑propelled portal cranes running on an auxiliary track to lift old track panels, place new sleepers and rails, and remove the old panels. Indian Railways began using PQRS in the 1980s to speed up track maintenance on busy routes.
How the system works
- Auxiliary track: A temporary track of broader gauge (about 3.4 m) is laid alongside the existing line. This acts as a pathway for the portal cranes.
- Portal cranes: The cranes are self‑propelled and can lift heavy rail panels (up to 9 tonnes). They run on the auxiliary track and remove old rails and sleepers.
- Panel replacement: After lifting old panels, the ballast bed is levelled. New pre‑assembled rail panels are then placed in position using the cranes.
- Quick work: Because the system is mechanised, track renewal can be completed within short traffic blocks, minimising delays and enhancing safety for workers.
Significance
- Efficiency: PQRS reduces manual labour and allows large stretches of track to be replaced quickly. This is crucial on busy lines where long traffic blocks are difficult.
- Safety: The mechanised system reduces workers’ exposure to moving trains and heavy lifting, improving occupational safety.
- Resource recovery: Old rails and sleepers can be retrieved completely for reuse or recycling, without arranging additional freight trains.
- Modernisation: PQRS is widely used in new line construction and modernisation projects, helping Indian Railways maintain higher speeds and safety standards.
Source: DD News