I did a seach on this but could not find exactly what I was after.
Would locks be used on all facing points,
On a single line branch would not every point at some stage be a facing point, so would they all need to be locked, or would it be required only on points where actual passenger trains ran over?
Would they be needed on points where very slow speeds would be used, ie. those on a station run round loop, goods/coal sidings etc?
My layout is a small single branch terminus BR(M) Manchester area 1959-60.