This is the HO Scale Bridge Crane Kit from Walthers.
Measures: 10-1/4" 25.6cm Wide x 9" 22.5cm Tall
Adjustable Length of 22, 24, 28 or 31" 55, 60, 70 or 77.5cm
Coal was the life-blood of any gas works and a ready supply was always on hand. Many plants were located alongside waterways, which allowed massive amounts to be delivered by ship. To reach into their holds, special bridge cranes with longer booms extending beyond the dock were used. These made quick work of unloading using a large clamshell bucket to stockpile coal nearby.
This impressive kit has a modular design and additional parts so you can build a longer or shorter version to fit your available space. With its superbly detailed steel truss work, operators cab, clamshell bucket, trolley and more, it will be a focal point of any scene. On the waterfront, it makes a great stand-alone coal dock, and its a natural at a steel works handling iron ore, coal, and stone.