1.   It was a pair of these sidebars on the left rail of the northbound tracks that broke, leading to the derailment, Sullivan and Garcia said.

2.   Perry ran to the northbound tracks, but Perkins froze in the headlight of the approaching train, then dashed back to the platform, the police said.

3.   The train should have been rerouted to the northbound track, but that did not happen.

4.   Railway officials in Bolzano said international trains will alternate on the northbound tracks until both tracks are cleared near the Brenner Pass.

5.   Trains used a second northbound track to bypass the accident until normal service was restored.