USB by every seat, small tables in the bays, (bioreactor) toilets, larger windows, underfloor heating, a more comfortable seat with extra padding, more standing space by the doors, more grab handles, additional passenger information screens by the doors, sensitive edge technology doors, faster acceleration, better interior lighting/ambience (partially because of the two panel light setup rather than one centre on the 707s), a more efficient traction motor featuring a forced air system which means regenerative braking can be achieved at lower speeds than on a mounted fan system etc etc etc.
I highly doubt Siemens would have been able to adapt a second batch of 707s to meet all of these improvements. And clearly they couldn't, considering that they submitted a non-compliant bid at the tender stage.
I can already say off the bat that the current batch was at max axle weight, which meant toilets couldn't be fitted even if they wanted to.
Another factor to consider is leasing cost.
If the 707s were more expensive to lease, even if they had ordered more would it have been as such a great quantity? Would we be getting 60 10-car units and 30 5-car units or just 90 5-car units?
The truth is that these are not lumps of plastic as people have been making them out to be for years now. Most realised that when they entered passenger service for the first time.
They might have teething problems, or those which are common across the whole family, but that applies to most new trains.
The main thing is that, overall, they offer a great passenger product for their duties, being commuter/metro, one that is an improvement over that offered by the Desiro City models (and by no argument the older trains)
You cannot argue that their downsides outweigh their many, many upsides.
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Of course, for drivers I can see your argument as well. The Desiro City driving experience is hard to beat. Nice desk, big window, lots of space, and large screens.
And it cannot be left out that when 701s were first delivered, it was clearly unsafe and unsuitable, or to use the words of those at the top, "not fit for purpose"
However, at least with all the adjustments stipulated by the unions, I can't exactly see how the driving of 701s would be much of a downgrade over the 707s.
You still get the big windscreen, digital displays, driving performance (which as aforementioned is actually better on the 701s), notch-less CPBC and all the other fancy modern commodities.
Sure, there's no arguing the cab is smaller (and depending on your preference less ergonomic) but it's still miles above the size of those on the 455s, 458s, or standard Desiros.