Here's the track plan, with a double switchback, small yard and passing track. Loop is Marx O-34 with Lionel O-27 switches, everything else is O-27 and Marx switches. Have to make a
Marx 1590 Metal Switches | O Gauge Railroading On Line Forum
My Marx - Classic Toy Trains Magazine
Marx 034 switches and post war trains? | O Gauge Railroading On Line Forum
Marx Trains Switch Track: Function and Repair Part 1 - YouTube
Marx & Co. 027 Manual Control Switch O Gauge Train Track Right BROKEN SWITCH | eBay
Lot Of Vintage Marx Train Tracks, Control Switches , 4 way & Transfromer. | eBay
Marx 1590 Metal Switches | O Gauge Railroading On Line Forum