Jimm - How exactly would loading/unloading be slower using a longer train but one with end doors? The only reason I can think of is if passengers all congregate near the same doors which is an easy problem to solve.
If it's that easy, why do people still bunch up around particular parts of platforms, as they have done since time immemorial? Go to Reading and look at how people behave there at the super new station where the bridge is well up towards the western end of the platforms.
It would be lovely to think that everyone will dutifully spread themselves out evenly along a platform, but they don't, no matter how many signs there are or announcements are made. At Oxford passengers towards London always cluster under the canopy near the barriers, no matter how many announcements are made that standard class coaches on an HST are beyond the footbridge - there are also notices written on the platform surface. Maybe people behave differently in Leeds, Huddersfield and Manchester, but I doubt it...
If new trains were bi-modes, which seems almost certain, then they'll need all the components of an electric train like the transformer. The AT300 design puts the pantograph and transformer in the driving vehicles, leaving no space for an engine. The remaining carriages then have to have more powerful engines to compensate compared to the other post-privatisation DEMUs, which all have one engine per carriage. That each carriage is 2-3m longer won't help either. If the engineers at Hitachi find it possible to use a smaller engine then I'm sure they'll use that instead.
Would it be more of an operational liability to not be able to take on as many new carriages? The ideal situation is that the TPE bidders can get a train manufacturer to order the perfect train for TP North - 125mph capable on electric power, capable of matching a 185 over the Pennines on diesel power and with wide gangways so that it works well in the core. Failing that, they'll have to make a decision and I'm trying to argue that in the light of the situation, the least bad solution is to get more carriages even if they're not ideally suited to the route. These less-than-ideal trains should then be designed internally to minimise the effects of the door layout, since the internal layout can make a difference to dwell times even with end doors.
The TPE bidders are planning on the basis that TP North will not be electrified within the term of the franchise.
I was wrong to say that they've 'always' been able to find a user, then. However, when a user did come knocking, as has happened more recently as passenger numbers have soared and the short new trains have proved to be inadequate, it was easy for them to add the HSTs into their fleet since all their staff and equipment were already ready to handle them.
If you have to order more trains than are required in the medium-long term for the interest of the short term, the least bad way of going about it is to buy the same model as is used elsewhere. That means the costs to the TOCs of adding them to their fleet in future are minimised. It's like how the ROSCOs did speculative orders for Turbostars back when they were being built. Even if they didn't immediately have a user identified, the ROSCOs knew that they would be able to find a user eventually without any major hassle. They wouldn't have gone and bought a completely or substantially different model speculatively because they knew they would have had much more difficulty then getting it leased out.
On the ECML, MML and GWML, 5 car sets can be doubled to use up the full length of the platforms available. 5 car sets on TP North would just waste the platform lengths available (after works at Huddersfield are completed) because the maximum length is somewhere between 7 and 8 carriages, and the minimum length of an AT300 is 5 carriages. If Hitachi whip up a bi-mode 125mph AT200 then there's nothing at all wrong with ordering four-car sets, since they could be doubled to efficiently use the platform space and then reduce operational costs off-peak.
The open-access operators get by with short trains because they aren't allowed to call at the major market stations which make longer trains profitable.
No one knows if we're talking an AT300 or AT200 variant potentially being offered by Hitachi and in any case, the Class 185 is a notorious lardbutt of a train, so a four-car aluminium-bodied bi-mode unit will likely carry rather less of a weight penalty than might at first appear to be the case if you are just going to rely on counting the number of coaches.
Nor am I aware of there being any reason you can't have a four-car AT300, the DfT just happened to specify five as the minimum for an IEP. There are certainly four-car A-Trains in use in South Korea and the AT200 can be built in any formation from three-car to 12-car.
I'd agree entirely that what is needed is something that can hit a decent speed under the wires and climb well on diesel but I'm afraid if you end up with end doors, even if on part of a train fleet, they will always be a liability in the Leeds-Huddersfield-Manchester section, unless you are suggesting carving out huge end vestibules, because there really is nothing you can do about long aisles inside coaches that only one person can move up and down at a time and that are blocked as soon as someone stops at a seat so they can put a bag on a rack or take off a coat, etc. And if the priority is to funnel as many trains through each hour as you can, having even one that needs an extra minute or two at each stop - and likely more at the key stations - can pose a performance problem.
FGW adding more HSTs to its fleet was a bit more complicated than short new trains being inadequate. Their issue with the 180s was rather more to do with the reliability problems, not that there wasn't suitable work for them, as they are admirably suited to the Cotswold Line and contra-peak jobs they are currently used on. FGW wanted something that was a known quantity and could run for a few more years as a reliable stopgap until the IEP turned up - which, of course, was meant to be a lot sooner than 2017.
I don't think comparisons with a few very modest speculative orders for Turbostars is helpful comparison when, if you are talking about AT300s, it is a specialised express unit, rather than a go-anywhere dmu which was pretty much guaranteed to find customers for the long term - and there is a limit to how many such express trains will be needed once all the 800/801/AT300s already on order are delivered. I repeat, without guarantees of long-term use, getting the finance to build anything in the first place will be a big problem, which is why dmu building has been at a standstill.
If you are talking about coupling up/splitting HT/GC services at Doncaster, that is an admirable theory but it would depend on them being able to get their trains in and out of there at the same time. Given how hard it was to path GC's West Riding services between Doncaster and Bradford amid the existing services, i wouldn't fancy trying it with enhanced TPE North and Calder Valley services. And since when have York (served by GC) and Doncaster (served by both) not been among the major market stations on the ECML?
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