Streamlined Thomas is from a dream scene sequence in the last movie (The Great Race) that went for around 10 seconds where Thomas dreamed of being streamlined and then woke up and he was his regular shape, for some reason this justifies a motorized toy version when there is already a version for each of the other main ranges including TM2. As a release for kids or a novelty for Thomas collectors I can see it being popular but for everyone else including those who know a Tank engine doesn't ever need streamlining because it could never go fast enough to warrant it anyway. 
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