I used to see #5167 on the T-4 in rush hours running to/from Bethesda & Twinbrook, when I was w/ RideOn in the late 80's.
Always liked seeing the baby Flxi's. I also liked the 8000 - 8600 series Flxi's.
Growing up, I always got a thrill, when a 6800 Flxi came by the house on the S9, and turned around at the end of the street, to return to the garage.