Mostly of interest to those who follow British Rail practice, if you have no idea what TOPS is then have a look at this old video (20mins):
https://www.youtube.com/watch?feature=player_detailpage&v=MKRpC1lcoDk
(Note: TOPS was originally developed by the Southern Pacific.)
https://www.youtube.com/watch?feature=player_detailpage&v=MKRpC1lcoDk
(Note: TOPS was originally developed by the Southern Pacific.)