The Broadway after Dec 1967 did not have the Master Bedroom equipped rear observation or all sleeper status. I seen it run past us at Strasburg [Paradise] in 1966 when it still was all sleeper with observation car. Then I seen it in Harrisburg in 1969 when a friend was getting on it for a return trip to Chicago; coaches, sleepers and diner and a lounge car. IIRC, it was The General's train set that was used after Dec.1967.
But even though it was deep in the PC era, there was still a measure of service pride as I witnessed the changing from a GG1 to an E-8/7 set. I never saw a man dive under the coupling and break down the steam line and stay there as the GG1 pulled away and the diesels came in, then make up the steam line while others were connecting the air and signal lines. Meanwhile two 'brass hats' were monitoring and checking their watches when finished, they were making sure Harrisburg wasn't going to be blamed for any delay to The Broadway!
Amtrak's first train re-equipped was The Broadway because the equipment was so deteriorated. I rode it in 1978, and we had a twin-unit diner, so I guess they improved it. It is too bad they did not keep it, I know they could not use the Fort Wayne line west of Alliance, they rerouted onto the former B&O from various points over a few years [Pittsburgh, Youngstown, New Castle]. Now if you are east of Pittsburgh and west of Philadelphia, you have to change trains in Pittsburgh to get the Capitol Ltd [that is when The Pennsylvanian resumes].
The Super Chief is a different story. I have no personal experience of the Super Chief while ATSF ran it. I do know that in 1973 they took the right of Amtrak to use the name "Super Chief" away because the service had deteriorated under Amtrak. I did ride the Southwest Ltd as it was called then also in 1978; the ride was better than the Broadway. We had a mixture of El Capitan and low level cars [the Super Chief too used to run jointly with the El Capitan], but the equipment needed more than the minimal maintenance they were receiving. Dining was very good, then Amtrak still allowed some individuality for menus, especially dinner.
AFAIK, some services such as barber, had been gone long before on both trains.