I had been tracking this mysterious move emanating from and returning to engineering works on the up and down fast lines south of Milton Keynes half expecting it to be a track machine. I was right; DR75012 passes Victoria bridge with the 10.00 Bletchley to Bletchley return that went via Nuneaton, Leicester and Wigston North Junction where I presume it reversed on the triangle. DR75012 is a Plasser and Theurer Unimat Dynamic Tamper that is owned and operated by Swietelsky Babcock Rail (SBRail) acting as a contractor for Network Rail.
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