North American Product Classification System (NAPCS) Canada [Provisional Version 0.1]

• 54 - Professional, scientific, and technical services
• 541032 - Engineering services
• 541032.1 - Engineering services
• 541032.1.4 - Transportation engineering projects

541032.1.4.4 - Railway engineering projects

All engineering services related to railways and related structures, including railway bridges and tunnels.