Subway trains advertising defunct, nonexistent lines are baffling NYC riders — but they’re not what they appear By Nicole Rosenthal Published Aug. 10, 2025, 1:23 p.m. ET ...

These cars have wooden bodies over reinforced steel frames. The New York Transit Museum has three BU cars: 1273 (built from 1903 to 1904), 1404 (built 1908) and 1407 (built 1908).