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Long high hood deeply notched at the corners. Notched nose may be high or low with two-peice windsheild over it. Large square radiator grilles and single round radiator fan on top. Long battery boxes on walkway ahead of hood on both sides. Long hood shows a row of three of five square car body filters on each side. Simple uninterruped frame profile. Eight handrail stanchions.
Long hood has flush-mounted radiator shutters low on the sides to the rear. Alco notched corners are milder. Low nose with steam generators. Cab is uniquely pointed as is the two-peice winshield. May have optional cylindrical fuel tanks. "C" usually denotes six-wheel truck locomotives,but in this case it stands for Alco's new (in 1963) Century series, with the "4" in 420 relating to four-wheel B-B trucks and the number "20" the horsepower divided by 100. Lightest of the Century locomotive, the C-420 competed direcly with EMD's GP30 and GE's U25B with some success.
The classic diesel road switcher configuration;high long and short hoods and with cab set back from front. Four cooling fans paired front and rear atop long hood. Two exhaust stacks. Frame profile has a deep center section over EMD-type rounded fuel tank. Dynamic brakes may be present with bulging blister midway along hood and with a large additional cooling fan.
Successor to the GP7,the GP9 is nearly identical. Later models did replace the four round cooling fans with two larger ones at each end of the hood,and the side skirt over the fuel tank was cut away. A few were built with a low nose,a hint of things to come.
