I ran one like that but bed was I think 60' long, it came from the Philadelphia ship yard. She would peel chips 1" x 1/16 and more all day and night for one cut. They told me it made the prop shafts for the ships in ww11.I remember seeing a lathe that had a 6' dia. chuck and a 20' bed on it. It had a fold out seat on the saddle for the operator to ride along. That was the largest lathe I have ever seen in person. It was at a place where I went to pick up a bridgeport head back in the mid 70's.
Yes , we do big machining like that today. When I was working as a service engineer for a machine tool manufacturer , I often serviced a new horizontal milling machine with a 120 foot long bed, the column was 22 feet high. The headstock spindle was 12 inches in diameter with a second 7 inch spindle inside it. The reach of the spindle was 7 feet. The tolerances for this machine was .0002"/ft.I wonder if any of these machines are still in use or even exist anymore. Do we in the U.S.A. still do machining on that scale?