Zonal Railways
Ministry of Railways : Railway Board
Zonal Railways
- Central Railway
- East Central Railway
- East Coast Railway
- Eastern Railway
- Metro Railway Kolkata
- North Central Railway
- North Eastern Railway
- North Western Railway
- North East Frontier Railway
- Northern Railway
- South Central Railway
- South East Central Railway
- South East Railway
- South Western Railway
- Southern Railway
- West Central Railway
- Western Railway
- Metro Railway Kolkata
- East Coast Railway
- Central Organization For Railway Electrification, Allahabad
- Chitranjan Locomotive Works
- Integral Coach Factory, ICF Chennai
- Diesel Loco Modernisation Works, DLW Varanasi
- Rail Coach Factory Kapurthala
- Mumbai Railway Vikas Corporation Ltd.
- Rail Wheel Factory Yelahanka, (RWF) Bangalore
- Central Organisation For Modernisation of Workshops (COFMOW)
- Indian Railway Institute of Civil Engineering (IRICEN), Pune
- Indian Railways Institute of Electrical Engineering (IRIEEN), Nasik
- Indian Railways Institute of Mechanical & Electrical Engineering (IRIMEE), Jamalpur
- Indian Railways Institute of Signal Engineering and Telecommunications, Secundrabad
- Research Design & Standards Organisation, Lucknow
- Indian Railways