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

Reference

upn0313b

BrickLink® #

x871b

Control Unit, Train 4.5V Whistle Brick 4 x 8 x 2 with Forward/Stop/Reverse Functions (part upn0313b) is a LEGO element. It appears in 2 sets, including Electronic Control Unit (Forward/Backward - Stop) and Electronic Train.