LEGO Set

Electronic Control Unit (Forward - Stop)

139A-1

Released: 1969 · Parts: 13 · Theme: 4.5V

Electronic Control Unit (Forward - Stop) (139A-1) is a 4.5V LEGO set released in 1969 with 13 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing 4.5V sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 6 unique part types.

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Parts in this set

6 parts · updating…

Control Unit, Train 4.5V Whistle Brick 4 x 8 x 2 with Forward/Stop Functions

upn0313a · ×1 · Trans-Clear
Electric Connector, 1 Way Male Rounded with Hollow Pin (Banana Plug)

996ac01 · ×4 · Red
Electric Connector, 1 Way Male Rounded with Hollow Pin (Banana Plug)

996ac01 · ×4 · Blue
Microphone, Train 4.5V 4 x 4 x 2 with Vertical Plug Sockets

upn0311b · ×1 · White
Whistle, Train 4.5V, Thick

upn0312a · ×1 · Black
Wire 12V / 4.5V with Two Leads [Undetermined Length]

74503 · ×2 · White