www.ntsb.gov/investigations/AccidentReports/Reports/RAR8801.pdf
www.trainorders.com/discussion/read.php?4,843938
https://cs.trains.com/trn/f/111/t/10404.aspx
https://web.archive.org/web/20160910044434/http://nrhs1.org/images/Dispatcher_Jan_10.pdf
https://mx-schroeder.medium.com/high-at-high-speed-the-1987-chase-train-collision-7059dd9871d7
https://en.wikipedia.org/wiki/1987_Maryland_train_collision
www.vimeo.com/128899388