Just saw this. It wasn't reported in the Taipei Times...
Blast injures 25 on Taiwanese passenger train, terrorism ruled out
It appears to have been a pipe bomb. "Terror attack has been ruled out by the police following its initial probe" according to article. Of course - must have been an overly enthusiastic guy belatedly celebrating 4th of July.
If detonating a pipe bomb isn't considered terrorism, then I'm Mickey Mouse.