Truck centers are the dimension from center to center of truck bolster, not the jacking pads.
This data is for units as delivered from the manufacturers.
Always refer to pictures of the unit to be modeled as many trucks are interchangeable.
The trucks were sometimes swapped by the Railroads or rebuilders.
TRK CTRS TYPE TRUCK WHB MODEL 27-00 note 1 DR-12-8-3000(Centipede) 32-03 AAR "B" 9'-10" DR-4-4-1000,DRS-6-4-660,DRS-6-4-750, 28-06 AAR "B" 9'-10" DR-4-4-15(BF)DR-4-4-15(SHARK) 30-06 GSC "C" A-1-A 11'-06" DR-6-4-1500 46-03 A-1-A pass 15'-06" DR-6-4-2000,DR-6-2-1000 32-03 note 2 DRS-6-4-1000,DRS-4-4-1500,DRS-6-4-1500, 32-03 note 2 DRS-6-6-1500,RS-12,AS-16,AS-416,AS-616 50-00 note 2 DRX-6-4-2000 37-06 note 2 DT-6-6-2000 28-02 AAR "B" 9'-10" RF-16 32-07 note 3 RP-210 22-08 AAR "A" 8'-00" S12 25-06 AAR "A" 8'-00" VO-1000 22-06 AAR "A" 8'-00" VO660,DS-4-4-660,DS-4-4-750,S8 Notes for BLW trucks:
1: trucks used on the "Centipede" special to this unit.
2: BLW used a variety of trucks refer to pictures for correct trucks
3: BLW hydraulic drive unit special trucks
AAR type "A" trucks used on switcher units had a whb of 8'-00".
AAR type "B" trucks used on road units have a whb of 9'-04" with GE traction motors and 9'-10" with Westinghouse traction motors.
A-1-A units used on BLW passenger units to reduce axle loading have a whb of 15'-06".
A-1-A units used on BLW road switchers units to reduce axle loading had a whb of 11'-06" with drop equalizers.
GCS "C" without drop equalizers the whb was 13'-00".