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Every time I'm in Hull Paragon there seems to be a team of people nursing at least 158. Yesterday evening it was two that appeared not to want to start.
I recently travelled on 158799, and it had a couple of failed starts at Lincoln. I believe (thanks to people on here) that the alternator was playing up as well, with carriage lighting dropping on and off.
I don't see why that should be, with 156s certainly, since they're exactly the same engines as 150s, nd most 158s do as well, albeit slightly uprated. 158s do of course have more of a load on the electrics, with air con and so on, so it might be more of a drain on the nattery, i suppose.