158 or 159?
I asked about this on the day SWT introduced the first 159/1 into service, there was a press trip from Waterloo and I had a look round the train at Salisbury. Management were there for a Q&A, so I asked why the trains were being classed as 159/1s.
According to the engineering director of the time, Mac Mackintosh, they were allocated subclass 159/1 purely to differentiate the three car units from the two car units in SWT's fleet, which would be left as 158s.
The 158s were to be renumbered slightly (to a consecutive sequence) to distinguish them as the only 158s fitted with retention tanks.
So for SWT planners, 158 = 2, and 159 = 3. I deduce from that that the 158s will not be renumbered.
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Presumably the 458/460 merger will allow some of the 450s to be moved onto the electrified "Hampshire Local" routes which are currently operated by 158s, and in turn SWT will be able to cascade some of their diesel fleet to other operators. Either way it's good to know the 460s have got a future.
Not so, the original post lists exactly which mainline services will be rejigged following the 458/460 merger:
The seven mainline services SWT expect to be strengthened are as follows:
Morning peak
Southampton Airport Parkway to Waterloo (8 car to 12 car in high peak)
Portsmouth Harbour to Waterloo via Eastleigh (5 car to 10 car in the peak)
Southampton Central to Waterloo (4 car to 5 car in the peak)
Evening peak
Waterloo to Poole (5 car to 8 car)
Waterloo to Portsmouth Harbour via Eastleigh (5 car to 8 car)
Waterloo to Portsmouth Harbour via Eastleigh (8 car to 10 car)
Waterloo to Alton (8 car to 12 car)
Nothing whatsoever affecting Hampshire locals or the Lymington Branch unit, so no cascades to other operators - and no reduction in DMUs on third rail...