- Component Products
 - Schaumburg - Manufacturer of traffic signal poles, shrouds, polycarbonate framework, and more. - Universal Coach Parts
- Des Plaines
- Chicago Trolley & Double Decker Company
- Chicago - Offers daily tours or special charters.
- Parking Block Store
- Hillside - Sells parking blocks, guides, speed bumps, safety signs, and cones.
- Standard Car Truck Company
- Park Ridge - Designs freight car truck stabilizer systems and bogie components.
- Lawrence Ricci Industrial Equipment Services
- Steger - Maintains, repairs, and rebuilds all makes of mobile railcar movers.
- Lothair Inc.
- Blue Island - Specialises in business communication for freight and passenger transportation industry. Services include media relations, advertising, direct mail, and more.
- Stimsonite Corporation
- Niles - Manufactures and markets reflective highway safety products.
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