... it until they have reached some way along it. Undercut switches can often be identified in photographs because the shiny top of the open blade stops some way short of the tip. joggle-3.gif 2_152258_310000000.png 2_152258_310000001.png Here are some photos of an undercut switch. You can see from the shiny marks on the top of the blade that it starts to take some part of the wheel load at about the position of the second stretcher bar. Up until that point it is simply guiding the wheel flange, and is dull on top: 2_171152_120000001.jpg 2_171152_120000000.jpg You can see that the tip is very thin, and if continued up to the top of the stock rail it would be a knife edge. The way to model this is to do the final shaping with fine abrasive paper (" Wet-or-Dry" paper from car shops), with the blade clamped against the stock rail. Notice also a seldom-modelled but quite prominent feature, the steel sole plate on the toe timber. It is used to hold the toe to gauge, so that ...