Why can Cambrian line only take 158s? Surely a 150 / 153 / 156 can run on themIn the case of TfW, 150s are their mainstay traction. With the 158 fleet being relatively small and a large proportion of it required to cover Cambrian diagrams which can’t use anything else, this doesn’t leave much else.
Not ideal, but it is what it is unfortunately. The 175 fleet wasn’t specified for Wales, and whilst they are excellent units and very suited to what they’re used on, there have never quite been enough of them.