What a spectacular but terrible train crash in Spain, with such a loss of life. Theories abound as to the reason the train was travelling so fast. No doubt the all will become clear in time. I found this European train accident data in The Guardian quite fascinating. You are certainly pretty safe if you travel by train in the UK. The stats also show that trains are very dangerous for people trying to commit suicide.
Without belittling the severe train crash with tens of people dead and many injured, do keep in mind that more people are killed in or by cars in Spain in a month.