Convert and modernize the basic Tracked Crawler #247-7070, sold separately, with this complete selection of unpainted metal kits. All items includes assembly instructions most can be built as positionable accessories. Originally built for laying larger pipelines, the versatility and ability to get into tight spots has made the side boom pipelayer crane a favorite for cleaning up railroad derailments and wrecks. Like the prototype, it′s designed to mount on a crawler tractor (247-7070). This highly detailed kit includes demountable weight plates, a weight box that can be extended in or out via hydraulic cylinders, a positionable boom that can be raised or lowered, plus the hook and block can be raised or lowered via a windable cable drum using a flat blade screwdriver. Details include all controls too. Kit includes 60+ parts.