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     	The 5660 Pressure Differential (PD) Covered Hopper was introduced in 1999 by Thrall Industries, as the most advanced design in the evolution of Pressure Differential Covered Hopper, a special breed within the covered hopper family. Production still continues today under the TrinityRail brand, following Trinity’s purchase of Thrall, with nearly 4,000 examples already built.
Features:
- Ready to run
 - Injection molded plastic
 - Fine scale detail
 - Separately applied wire grab irons
 - Separately applied wire cut levers
 - Etched metal roofwalks
 - Crisp painting/printing