Explore the intricate workings of a steam locomotive through an in-depth examination of the Union Pacific Big Boy. Delve into the mechanics of this engineering marvel, starting with the basics and progressing through each component. Learn about the firebox, boiler, feed water systems, and injectors. Discover the functions of the steam dryer, dry pipe, superheater, and multi-valve throttle. Examine the smokebox, cylinders, valve gear, and lubrication systems. Understand the chassis, frame, suspension, and braking mechanisms. Investigate the importance of sand in locomotive operation. Step inside the cab to explore its controls and instruments, including sight glasses. Finally, learn about the tender and stoker. This comprehensive video, created by Jacob O'Neal with expert review by Mark "Hyce" Huber, uses detailed 3D modeling and animation to bring the complexities of steam locomotive technology to life.