The Broadway Junction, or more properly, the Eastern Parkway station, opened in 1928 and stands 200 feet above the street only to have the tracks plunge into a tunnel just north of the station. The platform lamps are perhaps the only ones of their type still in use in the system. These lamps reflect that trend. For more about this station , see the above link. Officially, the concept of the IND, or the 'independent' subway, disappeared in 1940 as all three subway lines, previously run by different organizations, were combined as one system and run by the City.
Some signage dies hard.
This sign, in the walkway at Broadway and 35th Street, has been there since 1940 when the Sixth Avenue line originally opened. Seemingly since the Malbone Street wreck of 1918, the stretch of track that used to run between the Fulton Street El and the old Brighton line at Prospect Park had been allowed to deteriorate and rot. Indeed the entire Dean Street station was about to collapse by the early 1990s. Finally the MTA decided to rebuild the shuttle and it was closed for 15 months. However, a gleaming new line was born that even resurrected the moribund transfer to the IRT at Botanic Garden that was built but never used.