Hyperloop Design Document, August 12, 2013
By:
+David Herron; Date: Sun Jan 03 2021 15:53:30 GMT-0800 (Pacific Standard Time)
Tags: Hyperloop »»»» Vactrain »»»» High Speed Transit
Original:
http://www.teslamotors.com/sites/default/files/blog_images/hyperloop-alpha.pdf
Or: http://www.spacex.com/sites/spacex/files/hyperloop_alpha-20130812.pdf
Both those should be the same file.