S scale 1:64 block signals made by NJ International with operating LEDs.

 S scale block signals from NJ International

NJI 4401 D-type block signal, 1:64 S scale Brass construction 3 LEDs - red, yellow, green Common anode (+) wiring Height: 3.25 inches (83 mm) Current limiting resistors are attached This 3-light signal can be operated by a TS2 block signal circuit.
NJI 4314 B&O color position signal, 1:64 S scale Brass construction 7 LEDs - 2 red, 2 yellow, 2 green, 1 white marker Common anode (+) wiring Height: 4.5 inches (11.5 cm) Current limiting resistors are attached This B&O signal can be operated by a TS2 block signal circuit.
NJI 4345 SA type target signal, 1:64 S scale Brass construction One 2-color LED, red & green Illuminate red & green together to simulate yellow (sort of) Note: Combining red and green to make yellow is a subjective experience. We recommend experimenting with one signal before investing in multiple signals. Common anode (+) wiring Height: 3 inches (76 mm) Current limiting resistors are attached Operate this signal in simple red-green mode with an MRD1 or MRD8 infrared train detector, or, operate multiple signals in three-color mode with a TS2 train signal circuit.

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