14), are tapered to a fine point or tongue, and rigidly connected together at such a distance apart that when one of the points is pressed against the outer or "stock" rail (a) of either the siding or the main line there is sufficient space between the other tongue and the other stock rail to permit the free passage of the flanges of the wheels on one side of the train, while the flanges on the other side find a continuous path along the other switch rail and thus are deflected in the desired direction.
This line was originally designed as a " plateway " on the Outram system, but objections were raised to rails with upstanding ledges or flanges FIG.
This difficulty was overcome by paving or " causewaying " the road up to the level of the top of the flanges, but 1 " Another thing that is remarkable is their way-leaves; for, when men have pieces of ground between the colliery and the river, they sell leave to lead coals over their ground " (Roger North).
Jessop thus produced what was virtually the flanged wheel of to-day, having the flanges inside the rails,.
First laid on bridges - was supported on continuous longitudinal sleepers and held down by bolts passing through the flanges, and was employed by I.