Scientific toys always have a special appeal for collectors, here is one made by EDOBAUD in France around 1935. It is called "automotrice" and is made on the base of a passenger car with a motorized bogie in three rail O gauge. The front just had a light to figure it and the back is closed. It represent the type of rail cars used in the country on secondary lines, a sort of doodlebug for you. Luckily I just had the opportunity to buy an original box recently, always a plus for the collection...
Have a nice weekend, Daniel