From the PDF: "Feedback would be most welcome – please send to hyper loop@spacex.com or hyperloop@teslamotors.com . I would like to thank my excellent compadre

From the PDF: "Feedback would be most welcome – please send to hyper loop@spacex.com or hyperloop@teslamotors.com . I would like to thank my excellent compadres at both companies for their help in putting this together."