Colas 37421 awakening Redditch at 3am on a Network Rail Test Train - 01/04/17

On the 1st April, Redditch branch line was treated to not only two Class 37's top 'n' tailed on a railtour as seen here:
• 37069 and 37716 on 1Z7...
...but at 3:05am a Network Rail test train was working from Bristol High Level Sidings to Derby RTC via Redditch courtesy of Colas 37421, meaning 3 Class 37's down "the branch" in the space of 2 hours!
37421 is seen arriving and departing Redditch whilst waking up the neighbourhood for the second time that night with thanks to a spirited departure, and the sound of an EE exhaust note.
Well worth staying up until the early hours of the morning, enjoy!
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[@Synthematix]

Im looking for these coaches in N gauge, cant find them anywhere