Guessing the final scene of The Long Twilight Struggle wouldn't count since the Rangers were there to meet Sheridan, just as one met with Garibaldi in Coming of Shadows. Kept skipping about and noticed a Ranger near the end of Episode 22 - The Fall of Night. With Marcus arriving in season 3, would he become B5's Resident (and only) Ranger on the station?
Beginning around 40 minutes 45 seconds-ish, a Narn and Drazi are having drinks

and discussing what they saw in the garden. Ranger comes in from the left, passes behind Londo, and exits to the right.