I was talking about 79 today and it is indeed cancelled. There was a Tweet on AmtrakAlerts last night about 80 terminating at Baltimore with passengers transferred to 90, and consequently 79 getting cancelled. Also southbound Acela 2157 apparently terminated at Wilmington with passengers transferred to 2159, which itself was running hours late.
On the 22nd the Steel bridge in Portland OR failed causing the southbound Coast Starlight to be delayed many many hours. Apparently it arrived into EMY over 10 hours late, of which a bit more than 6 was lost at Portland, and then there was crew expiry etc. to contend with. It was already late into PDX to start with.