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Chicago Subway System

• Chicago Subway System: Clay Mining
  
• Chicago Subway System: Clybourn Avenue Portal Approach
  
• Chicago Subway System: Joining the L
  
• Chicago Subway System: Leaving the Compressed Air Lock
  
• Chicago Subway System: Men Hand-Mining
  
• Chicago Subway System: Mining the Tubes in the Loop Section
  
• Chicago Subway System: Reinforcing the Tunnel Arch
  
• Chicago Subway System: State Street Route Crossover
  
• Chicago Subway System: Workers In Underground Tunnel
  
• Healy Subway Construction Corporation