The Metro-Vicks were a standout for all the wrong reasons. Although the electrical system was considered quite good, the Crossley engine was quite a different matter. CIE had an entire fleet of these, and re-engined the lot. I believe they never ordered British engines again.
Here in Australia, the X class were a derivative, and famous for all the wrong reasons.
I remember doing performance checks on a Crossley engine at marine college, and even wearing aviation ear muffs, the noise was still deafening.
I recently read that the class was scheduled for re-engining with EE engines, but the engines went to the class 31s and the class 28 went to the scrapheap. There was a photograph in LI of two class 28's being towed to the scrapyard.....by a steam engine they were supposed to replace.