Kadee 566 HO Barber 70-Ton Friction Bearing Centering Trucks w/ 33" Back Wheels

#566 Barber S-2-B 70-Ton Self Centering Trucks with 33" Smooth Back Wheels - HO Scale "HGC" Two Piece Fully Equalized Trucks The Self-Centering Action trucks self align themselves parallel with the car for easier placement on track. Mounts with a #2 or 2-56 screw. Introduced in the 1930?s - Used through the 50?s before being adapted to roller bearings. Introduced in the late 1950?s - Used in interchange even today. "HGC" or High Gravity Compound, weighs nearly the same as Metal Trucks but with more detail & a 2 piece split bolster design for more efficient truck equalization, reduced axle friction for greater rolling performance. One Pair UPC: 765484005667 "HGC" Two Piece Fully Equalized Trucks Features: Self Centering Action - Trucks self align themselves parallel with the car for easier placement on track. Code 110 (.110) #520 33" Smooth Back Wheels "HGC" Weighs nearly the same as Metal Trucks Superior Rolling Ability #442 Brake Pads - Wide Bolster Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Fully Equalized Trucks Smooth tracking Free Rolling Contoured Insulated Axles RP-25 Free Rrolling Wheels Patent number 7,434,518 B2 Package Includes: (2) Each #566 Barber S-2-B 70-Ton Self Centering Two Piece Trucks (assembled) (2) #442 Brake Pads - Wide Bolster (2) Each Self Centering Bushing (2) Each #2 Screw The term Code 110 and Code 88 relates to the width of the wheels and has no relationship to track code. Code 110 wheels are .110" wide and Code 88 are .088" wide. Code 110 wheels are the common (or "Standard") width wheels and Code 88 are what is called "Semi-Scale" and are used when the modeler wants a more prototypical looking wheel width. Actual HO-Scale prototypical wheel width would be around .067" wide and although they will run OK on the average track they will not go through common turnouts and crossings. Code 88 (.088") is just about the minimum width of wheel that will run on most standard or common track if gauged correctly. It really is a matter of appearances because there's very little operational differences between running Code 110 or Code 88 wheels. Code 88 wheels look really good and are most noticeable on open frame cars like hoppers and tank cars. However, they also look great on boxcars, gondolas, and reefers but not quite as noticeable. As mentioned above track code and wheel code have no relationship meaning Code 110 and Code 88 will run on most any code of track. Track code is simply the measured height of the rail, code 100 is .100" tall, code 83 is .083" tall, code 70 is .070" tall, and so on.