"Amtrak Procurement and Program Updates"(PDF). Next Generation Equipment Committee. American Association of State Highway and Transportation Officials. February 22, 2019. Archived from the original(PDF) on March 4, 2021. Retrieved March 15, 2019.
"Amtrak Procurement and Program Updates"(PDF). Next Generation Equipment Committee. American Association of State Highway and Transportation Officials. February 22, 2019. Archived from the original(PDF) on March 4, 2021. Retrieved March 15, 2019.