So far as I know the entire fleet of 150s and 156s have had the absolute works spent on them so rather than condition it'll be exam hours you'd imagine. There is no reason why these units wouldn't last another 20 years. I think it's a misnomer to say "soldiering on".
It won't be corrosion issues that finish them off that's for sure if you remember the work on that 156 from EMT that was stripped to the frame.
Any units that come from elsewhere would be (in my opinion) in addition to the current fleet untill the new trains arrive, 500k to 1 million pounds a pop on a 150 will see to that.
Don't forget as well that the 15x fleet is currently being stretched to cover for multiple demic 195 units waiting parts and wheels from Spain. No "binning off" will be occuring anytime soon.
It won't be corrosion issues that finish them off that's for sure if you remember the work on that 156 from EMT that was stripped to the frame.
Any units that come from elsewhere would be (in my opinion) in addition to the current fleet untill the new trains arrive, 500k to 1 million pounds a pop on a 150 will see to that.
Don't forget as well that the 15x fleet is currently being stretched to cover for multiple demic 195 units waiting parts and wheels from Spain. No "binning off" will be occuring anytime soon.
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