The Timber shown in the photo,is has been explained, the end timber of a truck chassis,the longer truck timbers were also available,these Coal Trucks were being scrapped in the 50`s,and these timbers were freely available.
When my Father got involved with Smallmines in 1952,the cog that held the framework of the shute going up the side of the mountain,was built from these Oak Sole Bars,as they were called,and we had Gate posts on the farm made from them,i bet they are still there today.