Truck names

We've all seen those four-axle trucks we call AAR Type A or B But really, is there a real name for these? I've seen the "AAR-B" referred to as a swing-bolster design, but that sounds more generic.

All trucks have "real" names. Hi-Ads, Blombergs, Drop Equalizers, Blunt, Radial, etc. Depends on the exact truck, and the trucks are easily identified, with something like "The Second Diesel Spotters Guide", or some similar type of book, that covers most of them, with good pics as well. Regards....

Well I understand that, HiAds were an Alco design/trademark, as was the trimount truck. Don Dover or someone of X2200S first applied "Blomberg" to the truck, after its designer, since EMD had no name for it (this was in 1968).
But at least, who designed the "AAR" switcher and road trucks?

Locomotive Trucks and who used them:

AAR Type A
EMD - Switchers
ALCO - Used on Switchers after 1950
Baldwin - Used on Switcher after 1940
Fairbanks-Morse - Used on Switchers after 1940
Lima - Used on Switchers after 1940

Blunt Trucks
ALCO - Used on Switchers till 1940

AAR Type B
GE
EMD
Baldwin
FM - Used on Road Power Untill 1949
MLW Canadian design 106 inch wheelbace

C-Line Trucks
FM - Used on all FM units after 1949

Blomberg
EMD - Used on all B-B units after 1939

Flexicoil
EMD - Used on Switchersand some Canadian GP9's
EMD D-D used on DD35 wheelbase 205 1/2 inches
GE 3 axle used from 1969 forward
GE 2 Axle used from 1972 forward
MLW C-C Design 134 inch wheelbase
A1A Trucks:
EMD used on all Passenger Locos since 1937 wheelbase is 169 inches
ALCO used on all Passenger Locos wheelbase 186 inches
Baldwin used on all Passenger Locos wheelbase 186 inches
FM used on all Passenger Locos wheelbase 186 inches

A1A Swicher Trucks
ALCO Swicher Trucks have a wheelbase of 126 inches
Baldwin Switcher Trucks wheelbase 138 inches
EMD Swicher & branchline locos wheelbase 163 inches

Trimount Trucks:
ALCO used from 1951 forward wheelbase 150 inches
FM used 1951-1953 wheelbase 156 inches
Baldwin 1951-1953 wheelbase 156 inches
Lima 1951-1953 wheelbase 156 inches

Hi-Ad Trucks
C-C Trucks wheelbace 163 inches
BB Trucks wheelbase 112 inches
Users: ALCO, MLW, GE, EMD