here's a little info on it:
They have been changed after an unlucky accident, which happened on June, 14th, 1986, in which the wheel assembly of a trains last section broke off. In case of that, the car hits two support pillars before entering the third loop. Three people were killed and one was injured seriously. Tripple Five corp., which owns Edmonton Mall and the park, claimed a Schwarzkopf design flaw caused the accident.
But evidence showed that Fantasyland (Now called Galaxyland) had ignored a special inspection order from the General Safety Services Division. Cars were checked only by visual inspections and not by taking them out from service. Visual inspections alone would not have been adequate to determine if screws or bolts were loose. And many bolts were loose during the first time of operation. Further, the Schwarzkopf manual was never translated from german into english. It directs workers to perform weekly checks on all the screws and bolts. After the accident it was discovered, that one-quarter of all axle bolts on the train were loose. No safety check has been made trough the german TUV organisation, which is worldwide wellknown for their profession regarding amusement rides, in order to safe money. Now, every 15 runs on each train it goes in for inspection.
You can find an article here:
it's not free, but only $3 to view the full text of the article. I wasn't able to find much - if I come across anything I'l post it here for ya.