INDIAN RAILWAYS
- Central Railway
- Chittaranjan Locomotive Works
- Diesel Locomotive Works
- Eastern Railway
- East Central Railway
- East Coast Railway
- Metro Railway
- Northern Railway
- North Central Railway
- North Eastern Railway
- North East Frontier Railway
- North Western Railway
- Southern Railway
- South Central Railway
- South Eastern Railway
- South East Central Railway
- South Western Railway
- Western Railway
- West Central Railway
CONTRACTORS to RAILWAYS
- Larsen & Tubro Ltd.
- Tata Project
- Kec International
- Premco-Umesh (JV)
- Best & Crompton Engg Project
- COBRA
- SIKKA