In the center of the photo you can see a forklift moving a set of wheels. To the left you can see a tall yellow pole. That is a jack that is used to lift up one end of a passenger rail car. The car is blocked at one end so that it can't roll, then jacks are placed on both sides of the other end of the car. Then, the passenger rail car is lifted up. The wheel truck can then be removed and a new wheel truck rolled in. The wheels can then be refinished as shown in previous slides.
The photos in this slide show were taken in the mid-1990's by Steve Grande on his Amtrak travels throughout the nation. The size of the photos is purposely smaller as disk space was expensive and download speeds were slower at that time.