Here is a Marx O gauge plastic train accessory from the 1950's and 60's.  It is the #0442 Derrick, a gray plastic gantry crane with red feet and black New York Central lettering on the crane cab.  This one is NOT COMPLETE, as the string and hook are missing, as is the ladder that should go on the side.  The crank mechanism with handle that sticks out the side is also damaged.  Still, what is here is presentable, and perhaps someone either can complete this one, use it for parts, or perhaps customize it!  Photos show the accessory from all 6 sides, with a yardstick in the shots for size reference.  The unit is about 8 1/2 inches tall at the highest point, and the superstructure underneath is about 3 3/4 inches by 3 3/4 inches.  Would look nice on your layout, don't you think?  Priced to sell, with only actual USPS Ground Advantage or Priority Mail shipping charged to the winner!