...I am surprised no one is talking about Barry's 'impossible' feat with the train and carriages. I don't usually bring up feats but this one was so unprecedented it almost broke all the rules thus far set on his limitations - another strong hint that Barry's limits are largely psychological in their root and are self imposed mental blocks. He constantly limits himself.
It certainly was over the top. I don't see how he could vibrate the whole train like that. And if he could what stopped him from vibrating the tracks and having the whole train phase through?