Last reviewed 30 Sept 2026 · 6 min read
Why railways run on manuals
A railway is a safety-critical system operated by thousands of people across a vast network, with trains at speed on shared track. Uniformity is essential: every driver, station master, engineer and signal maintainer must apply the same rules, and every structure and track must be built to a common standard so that any train can run on any line. The engineering practice of Indian Railways is therefore written in a hierarchy of rules, codes, manuals and standards, which a railway engineer is expected to know and apply.
The legal framework
- The Railways Act, 1989 — the parent Act; it deals with the construction and maintenance of railways, the responsibility of the railway administration, the powers of the Commissioner of Railway Safety, the fares and freight, accidents and offences.
- General Rules (G&SR) — the General Rules and Subsidiary Rules for the safe working of trains; every railway employee is bound by them; they cover signals, movement of trains, the protection of the track and the duties of staff.
- Metro Railways — governed by the Metro Railways (Operation and Maintenance) Act, 2002 and the rules under it (the Metro Railways (Construction of Works) Act, 1978 for construction).
Manuals and codes for engineering
| Document | What it covers |
|---|---|
| Indian Railways Code for the Engineering Department | The organisation, duties, procedures, powers and responsibility of the engineering department (works, maintenance, land, contracts) |
| Indian Railways Permanent Way Manual (IRPWM) | Track: rails, sleepers, ballast, geometry, maintenance, tolerances, curves, points and crossings, LWR, track renewal |
| Indian Railways Works Manual (IRWM) | Construction works: planning, estimating, contracts, execution, quality and accounts for new works and open-line works |
| Indian Railways Bridge Manual | Inspection, maintenance, rating, repair and rehabilitation of bridges |
| Indian Railways Bridge Rules | The loading standards, dynamic augment and design stresses for bridges |
| IRS Concrete Bridge Code / Steel Bridge Code / Bridge Substructure and Foundation Code | Design of concrete, steel and substructure/foundations of railway bridges |
| Schedule of Dimensions (SOD) | Maximum moving dimensions of vehicles and minimum fixed dimensions of structures (clearances) |
| Indian Railways Standard Plans | Standard drawings for turnouts, girders, culverts, track components, platforms and buildings |
| Indian Railways Manual of Fixed Track / P.Way items | Track components and standards; USFD Manual, LWR Manual, Track Machines Manual |
| Indian Railways Works Standard Specifications | Materials and workmanship for railway works |
| Land Management Manual | Land acquisition, records and boundaries |
Where the railway's own standard is silent, the railway may refer to the Indian Standards (IS codes) and the IRC codes, in an appropriate way.