When did CR stop using their cabooses on their trains?I was just re-reading the 2-volume set on the history of Conrail published by Railpace Publishing back in the early 1990's. While they don't list a specific date they do list several pieces of legislature that led to reduced crew levels on trains. An educated guess would be that the move to going caboose-less started in 1981 after the passing of the Omnibus Budget Reconciliation Act. Among other things that Act allowed Conrail to layoff 20,000 employees (many who were train crew I'm sure), and to exempt Conrail from the full-crew laws that many states had in effect at that time.
Hopefully a Conrail employee can further detail things for you...I'm just taking an educated guess based on the information I read.