[Torquay]

Is their any Electric Traction Engineers who can answer my Question.
In late 1967 I was on a Holyhead, Crewe, Euston Mail Train a class 40 brought it to Crewe, and I took over with an AL 5, the speed limit was still 100 mph, I pulled out of Crewe, and once clear of the platform I really notched her up I was soon at 50 mph and approaching a neutral section,the controller was showing 60% full power, I moved it back to the run back position, and once clear I opened her up to 80% full power, and I was soon on the magic 100 mph. At Rugeley I notched up more and next I was doing 105,and it did not shut down the traction motors, on approach to Litchfield I was on 110/111 mph, and suddenly their was an almighty crack, i must have left my seat about 10 inches, and considering the door to the engine room has a very small window, it was daylight in the cab, I closed my controller and thought what have I done, could smell like burning metal, when I dropped down to 80 I gingerly opened up, and nothing, 2 more notches and she was away. I checked in the engine room at Euston but could not find anything wrong so it was later back to Crewe, I believe 2 days later it failed, for what I do not know, I just kept Mum on it. can anyone tell me why it did not shut down at 100/101 mph as normal. Torquay.