Kadee 556 | Vulcan Double Truss Self Centering Trucks with 33" Ribbed Back Wheels - Metal Fully Sprung (HO Scale)

#556 Vulcan Double Truss Self Centering Trucks with 33" Ribbed Back Wheels - HO Scale Metal Fully Sprung Equalized Trucks Mounts with Kadee Self Centering bushing on a flat surface with a #2 or 2-56 screw or without the Kadee Self Centering bushing on a 0.140" or smaller molded on truck post secured with the original screw. The Vulcan truck was introduced in the 1920's as another replacement for the archbar truck. The Vulcan design incorporated a pin which held the journal box in place. Removal of the pin allowed the journal box to be quickly replaced. This truck lasted to the end of the steam era on mainline railroads and somewhat longer on logging railroads. HO-Scale Metal Fully Sprung Trucks Features:  Self Centering Action - Trucks self align themselves parallel with the car for easier placement on track. Code 110 (.110) #523 33" Ribbed Back Wheels Accurate Markings Incredible Detail True to Prototype Non-Magnetic Metal Wheels Highly Flexible Sprung Trucks Metal Sideframes & Fully Sprung Self Centering Bolster Smooth tracking Free Rolling Contoured Insulated Plastic Axles RP-25 Free Rolling Wheels #637 HO Scale Truck Springs Patent number 5,768,999 Package Includes: (2) Each #556 Vulcan Double Truss Self Centering Trucks (assembled) (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.