27, equipped with drums, booms, etc., is much used both for skidding in the logs and then for loading them on the cars.

It is itself mounted on a flat car.
An improvement on this is the locomotive boom derrick which is widely used both on the Pacific coast and of late in the Lake Superior region.

It is a combined locomotive, skidder and loader.

Its most unique feature is that it can be lifted off the track so as to allow flat cars to run underneath it.

This feat is accomplished thus: A device, which is something like that used in elevating the bodies of coal wagons, lifts the engine several feet above the rails.