D36 These are very! very! early prewar Marklin there 4- left hand switch, there are 2 right hand switches, also a cross over and  Were made before World War 2 ,late 1930ies. very hard to find. now they are 16 volt. LOOK at all the photos, it is stamped on the switch, O-L-16,, meaning O- gauge, Left hand, 16-Volt. they also have the red stamp on the back. also, some orig wiring. Also, there are some parts that  come with a wooden box. The box is dated july 16  1912. The track measure 1-7/16" out to out on the rails. Not quite the 1/2", it has to be mm being German? But a Lionel car did fit wheel wise. Selling as is shown with no returns on used items. Thank You for looking will combine on S/H, shipping UPS