Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Jet Engine TOO Fast

This is probably the most disappointing Thomas item we have purchased. This, along with Cranky the Crane, were the two toys our son wanted the most for Christmas. This train WILL NOT stay on any of the two tracks we have - one Thomas Track and one generic. I strongly believe there is a design flaw. My son is so disappointed every time he tries to use it and now just leaves it alone. This is extremely frustrating not only because of his disappointment but also the price tag. I would strongly recommend NOT purchasing this time.