@jacktatttran.bsky.social the 71 and 73 have historically boarded in the lower level of the harvard busway, where the platform is on the left. following the phasing out of the dedicated trackless trolley fleet (with left hand doors) in 2022, buses have had to board in the upper busway, head the wrong way out of the station, and loop back toward the south to continue west, which the t would like to avoid by ordering some of their bebs with left hand doors.