Once again, why did the EB locomotives derail?
Was not there but...,
Ran over a derailer, pick a switch, ram the coaches, the rail spread under the load, rail flip over, someone remove the rail spikes, the engine was seized for a bad debit, there was ice built up between the tracks, there was a asphalt built up between the tracks, a wheel cracked, a truck crack, I am sure that a few are missing.
Please feel free to pick one. All are cause of derailments or the engine getting put out of service. All have happen in the last 15 years.
Does it really matter. Railroading is a outside sport. Stuff happens.