SD45-2 - these started roaming systemwide right before the end. I got several on video in Indiana (both around Indy and up north) in 1998 and 1999.

SD60I - These weren't exactly rare (there were 60 in the fleet), but Conrail was the only original purchaser of this model

C30-7A

C36-7

B36-7

B23-S7 (ex-Monongahela; 10 units numbered CR 2300-2309). I did see one of these passing through Anderson once, so that is proof that at least one escaped Pennsylvania on one occasion!

B40-8