63. The failure of—
(a)an axle;
(b)a wheel or tyre, including a tyre loose on its wheel;
(c)a rope or the rope’s fastenings;
(d)a winding plant or equipment involved in working an incline; or
(e)any part of a train which is likely to cause an accident to that or any other train, or to cause personal injury to any person,
which occurs or is discovered whilst the train is on a running line.