The standard for freight cars is available in standard sizes of 28", 33", 36", and 38"
AAR Steel Classes (A, B, C, L, D): Wheels are classified by the carbon content in the steel, balancing wear resistance and thermal capacity.
Class B, C, and D wheels are most commonly used in freight cars and locomotives, as governed by specifications like AAR M-107 Specification.
Forged wheel for high capacity Freight Wagon. Standard AAR.
All freight car wheels nabufacture for AAR interchange service must be heat-treated and of a low-stress design.
AAR M-107 Standard. For Freight also standards: EN-BS-IRIS-TB-UIC-GOST-JIS
Grade F (Double Normalized and Tempered): The absolute standard for typical heavy-duty freight operations. Any freight axle with a nominal diameter over $6\frac{1}{2}\text{ inches}$ at the center must be Grade F. The process utilizes two distinct normalizing cycles (the second at a lower temperature to radically refine grain structure) followed by tempering to relieve thermal stress.
EA4T is a high-performance Chromium-Molybdenum (Cr-Mo) alloy steel. The addition of chromium increases hardenability and wear resistance, while molybdenum enhances toughness and counters temper brittleness.
Its primary historical framework was originally modeled on a modified version of the American AAR M-101 specification. The foundational standard (TB/T 2945-1999) specifically standardized the highly ubiquitous LZ50 carbon steel grade, which remains a massive cornerstone for Chinese rolling stock, freight wagons, and passenger coaches.
Wheelset Standard gauge
The gauge wheelset normally manufacture between 935mm to 1676mm.
The axle of the locomotive wheelset is equipped with transmission gears to provide traction during the locomotive's travel. The locomotive wheels have a larger wheel diameter, more production processes, and a complex assembly process.
