N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550145 - 50005678 Self-Propelled Gun After extensively testing five prototypes

After extensively testing five prototypes in 1933

since it derived from the previous model M3 “Grant”

This kit has not been issued with this decal scheme since 1973

Smi 35 x 5

N Atlas Trinity PD5000 Covered Hopper Grace Davison [NAHX] #550145 - 50005678 Self-Propelled Gun After extensively testing five prototypesThe Pressure Differential, or PD covered hopper was designed as a competitor to the General American Transportation Airslide hopper in the early 1970s to transport light, powdered materials. Unlike the Airslide, which forced pressurized air up through a fabric liner to help fluidize the cargo, the PS series of hoppers applied both a positive pressure of about 15 lbs. psi above the outlets as well as a vacuum at the outlet to help draw the cargo from