At one point Weybridge fasts were Alton trains, it seems to have varied over the years between that and the current Basingstoke stoppers.One interesting thing about the Alton trains is how much they've slowed down compared to the 90s. In the 90s, before Woking, they were either Clapham only or, in some years, non-stop. By contrast they all (or did before Covid - I will admit to not paying so much attention post-Covid) stop West Byfleet in addition to either Clapham or Surbiton, but that isn't really the reason; they have an unfavourable path into Woking due to a conflict with the Portsmouth fast.
Journey time in 1997 was 1hr02 for the regular off-peak service: Woking in 25 mins, then straight out and down to Alton.
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Except running long trains Mon-Fri midday (which I would imagine would be considerably less busy than departures from Waterloo around 2000) presumably leads to more mileage and wear and tear, though does have the advantage of less ECS workings requiring staff to drive them to and from the depot. Swings and roundabouts I guess: there's definitely been a change in philosophy over the years. In 1997, during the early years of SWT, practically all Altons and Basingstokes were 4-car off peak but lengthening to 8 or even 12 occurred in the peak. Same pattern occurred in NSE days in the late 80s or early 90s; short trains off-peak, long in the peak; this issue has been discussed in previous threads.
SWT made the decision to stop splitting down to shorter trains during the day as it was causing various performance issues. That change has happily coincided with the network getting busier across the day. Anecdotally I've been on Windsor line trains that are full and standing after 10am which would never have happened nineties/early 2000's, and that's with 10 vice 8 coaches. I suspect on many routes it would only be justified to go down to 4 coaches for a couple of round trips at most.