Pipeline transport has been around for ages at my first job BHRA we had a real small scale test rig I was offered math modelling or working on that department.
I didn't fancy crawling 1/4 a mile down a tube to unstick the pigs (with a one tone load) when they got stuck.
Ps Elon if your reading this I am sure that my old Boss at BHRA can put in touch with the research we did back then