Athearn Genesis 82374 HO Scale EMD GP9 Great Northern GN 682 DCC and Sound Era_1948 + Torque-Control™ adjustable slipper clutch

Torque-Control™ adjustable slipper clutch

Walthers Proto 920-42402 HO Scale EMD GP7 Chessie System C&O 5741 DCC and Sound

The demonstrator units would barnstorm across the country to help promote the new technology

Bobber Caboose

Athearn Genesis 82374 HO Scale EMD GP9 Great Northern GN 682 DCC and Sound Era_1948 + Torque-Control™ adjustable slipper clutchAthearn Genesis G82374 HO Scale EMD GP9 Great Northern GN 682 DCC and Sound In 1949, EMD introduced the GP7. The basic design followed most diesel switchers with the addition of a short hood instead of an end cab. The hoods were also full height to better accommodate the diesel engine and mechanical and electrical components. In 1954 EMD upgraded the GP7 to become the 1,750 horsepower GP9. Externally, the first GP9s were virtually unchanged from the