The single hinged unit with 3 luminaries (rectangular white marker light on outside, round Halogen headlight in the middle and round red tail light inside) was typically known as a "WIPAC light cluster".
WIPAC is the manufacturer (still around and does non-rail stuff as well).
The originals used filament builds throughout - although the original filament marker light bulbs were often later swapped for LED direct plug-in replacement bulbs. The later 3 luminary clusters came with fixed LED units as standard.
The even later style with only 2 round units, have gas discharge/HID headlights and a multi-colour LED unit for the marker that can display either red or white (hence only need one luminary)