From my notes, here is an actual consist at Harrisburg of a few months after the 2/1/68 PC merger on a Broadway Limited I rode from North Philly to Chicago leaving on Wednesday, April 10. 1968:
Diesel-electric locos 4259, 4291, 4254;
Sleeping Cars N&W 1418, Fishing Rapids, Catawissa Rapids, Charles Lockhart, Harbor Rest, Imperial Bower;
Diner 4609;
Coaches 1148 (ex-D&RGW), 4048, 4062;
Added at Harrisburg en route from Washington: coach 4046 and Clearfield Rapids.
Here is the eastbound Cincinnati Limited from Cinci to Columbus on Sunday April 29, 1968:
Locos 4291, 4309;
Mail car ACL 1669;
Sleeping car Little Miami Rapids;
Coach 4006.
Here is the connecting and merging eastbound PennTexas consist I rode from Columbus:
Locos 4312, 4256;
baggage car 931:
coaches 4105, 4256;
diner 4489,
sleeping car Buffalo Rapids;
coach 4057;
sleeping car Fairless Hills. (the last two cars presumably went Harrisburg-Washington).
Hope this helps.
John Pawson