The one thing that still is a bit confusing for me is this part:
The Pink train was then instructed to back through the track switch, towards the Magic Kingdom loop. At about the same time, the Purple train, which was inbound to the TTC station, was instructed to stop at the station to detrain passengers. For undetermined reasons that are currently under investigation, the switch had not changed position needed to allow the Pink train to be routed to the Magic Kingdom loop, which resulted in the Pink train backing down the same track it had just come from, putting it on a collision course with the Purple train. The Pink train passed through the TTC station and struck the Purple train while it was outside the station.
So, was the Purple train already moving backwards when it got stuck? If it was detraining the passengers, it should be fully in the train when it got struck, and stationary. So how come it was struck "while it was outside the station"? The only possible reason for this would be that Purple was already reversing itself and not moving fast enough outside of the station. But this doesn't make any sense either.
Now I'm confused.