MARC Penn Line 685: Baltimore Penn - Washington Union 

Once again, took MARC to DC and then the Metro to one of their events, this time being the 2024 MetroFest at Branch Ave. Apparently, our cab car, 7853, had a horn exchange. Now it sounds more like a MARC IV K5LA instead of its usual K5LA. Definitely wasn't expecting that...
Also 98 had the weirdest consist of any Silver Meteor I've seen.
Train Stats:
Train: MARC 685 (MSA-WAS)
Locomotive: Siemens SC-44
Cars: Kawasaki MARC III Bilevel (4), Sumitomo/Nippon Sharyo MARC II (1)
Operational Speed: 90 mph
Recorded 7/27/24