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This is a set of 36 long hood LNER style 4-aspect Westinghouse searchlight signal heads with provision for a pair of PLCC4 LEDs. A suitable LED is available from Rapid Electronics part number 56-3000. As an alternative the top LED can be a single colour yellow PLCC2 LED Rapid Electronics part number 56-2994
This signal type is still in use today and is typical of the type used widely over the former LNER network. The model is to 1/76 scale suitable for 00.
As well as the openings in the back to take a PLCC4 LEDs there is a 2.5mm diameter socket in the bottom to fit the head on to the top of a tube and holes in the side of the LED housings to take the wires from the top LED to the bottom housing to simulate the conduit.