The axle load weights as listed for the Class 19A are with the trailing truck compensating beam pin in the leading of the three holes.
32.
The axle load weights as listed for the Class 19AR are with the trailing truck compensating beam pin in the centre of the three holes.
33.
Roller bearings supplied by Timken or SKF were used on the four wheel pilot and trailing trucks as well as the six wheel tender trucks.
34.
On a cab-forward, the leading truck supports the firebox and the trailing truck and smokebox are at the rear next to the tender.
35.
This larger firebox improved the engine's coal burning efficiency, however the additional weight facility adding the second wheel set to the trailing truck.
36.
The axle load weights as shown for the Class 19BR are also with the trailing truck compensating beam pin in the rearmost of the three holes.
37.
The F2a was styled after the Milwaukee Road " Hiawatha " " Atlantic ", but with a four-wheel trailing truck to support a longer firebox.
38.
The three-axle trailing truck supporting the firebox was unusual, carrying over 190, 000 lbs, allowing the huge firebox needed for the high power.
39.
As built, the Class GF had inside bearings in their two-wheeled trailing trucks and considerable trouble was experienced with hot-boxes on these axles.
40.
F A 9 also differed from the standard rebuilds in that its trailing truck had outside journal boxes instead of the internal type used on the other engines.
