Class 37 - Europhoenix - 37901 - Exclusive37901 Mirrlees Pioneer When the six cylinder Mirrlees Blackstone MB275T power unit was first lowered into carbody of the former 37150 it is unlikely that anyone involved in the re engineering project envisioned it would still be working 38 years later, especially as the Class 38 project for which the engines were intended would be cancelled only a few months later. Built as D6850 in 1963 and already 23 years old when it was plucked from obscurity to