A railroad truck or bogie holds the wheel sets of a rail vehicle. Whether you’re replacing wheels or upgrading couplers, we have all sizes and styles to meet your needs from trusted manufacturers. Wheels come in many different sizes. For freight and passenger cars, 28-inch, 33-inch, and 36-inch diameter wheel sizes are most common. 28-inch wheels are sometimes found on older equipment but are most frequently seen in modern times on multi-level auto racks where reducing the car height as much as possible is the goal. 33-inch wheels have been the most common size for most of the 20th Century. 36-inch wheels are seen on more modern cars, especially open & covered hoppers, tank cars, and coal gondolas.