On Feb 19, 3:00*pm, "John Rowland"
wrote:
It would prevent any chance of the points moving under the train.
http://en.wikipedia.org/wiki/Lock_(d...&btnG=Search&m...
The point was about the points possibly moving under the train because
the lock may have *failed* which is a bit more serious than the points
being stuck in position. Do try and keep up.
B2003