I am making curves to show all of the muscles in the shoulder. I want to turn the lines into small tubes to show muscle fibers. The rail tool can do one at a time, but how can I do all of them at the same time? There are over 1,000 lines.
Just adding to what Pascal said, you can use _ExtractPipedCurve command to convert your ‘display only’ curve pipes into standalone mesh objects. May be easier to deal with, depending on what exactly you are doing.