I worked on the Chessie before CSX here’s what I seen.
Cars from the West would include WP,UP,SP,GN,BN,SF among others.
Cars from the South CRR,L&N,SDB,ACL,SCL,Southern,Family Lines,N&W and other cars.
Cars from the East,PC,RDG,NH,E-L D&H among others including early CR.
And thousands of short line IPD boxcars,Railbox ,Rail Gon,CP,CN,GTW,PFE,FGX,UTLX,GATX.
Some 40’ and 50’ boxcars with roof walks,tank cars with walkway,covered hoppers,coil cars etc…
Yes,there was waffle boxcars,a lot of the (new) 70 era boxcars like you see today.
Chessie wasn’t all about coal,there was intermodal trains,grain trains,coke trains just to name a few.
Who can forget the Chessie Steam Special and the Chessie Safety Express?