Unidentified North East regional Amtrak passenger train by Doswell 4-24-24 CSX P something

This train came literally when i arrived at Doswell about 06:30 in the morning. I was unable to get the ID. It was one of the several North East regional Amtraks that frequent the RF&P sub.
CSX Baltimore Division
RF&P Sub
MP CPF 20.8
Ashland Va
BD Disp Ch 20

[@scandncarearailfanner4886]

Amtrak 174

[@AntiSocialRailfanProductions]

174 would come through a few hours later. There were a couple of locals who speculated it was a late P138, but didn't know for sure. 138 would also pass later that afternoon.

[@norfolksouthern3800]

@@AntiSocialRailfanProductions did you find out who it was?

[@AntiSocialRailfanProductions]

Not for sure. The NS and SC area guy could be right about it being 174, the other people could be right about it being 138. One thing for sure, it was a northeast regional.