As a passenger I cant comment on the differences between a Class 170 and 171 however the service on the Uckfield line has been awful recently and as said one of the big issues has been short formed units. Its not quite so bad when the units are shortformed in the morning as those south of Hurst Green can at least get on the train, in the evening they often cant fit on the train and can have up to an hour wait for the next train.
In addition the difficulties of boarding and leaving the train add significantly to dwell times at the stations.
Twitter is full of complaints from passengers although Southerns response is less than satisfactory as they give the impression of not really caring, well to be precise its down to management failure. A number of staff are excellent are at trying to keep passengers informed. For example it invariably falls to a driver (who's not far away!) to tweet about short formations, and to give explanations as to why they are short.
Whilst all this is happening Southern have 2 3 coach trains which presumably they are paying to hire sitting around doing nothing which has to be daft.
I bet one of the main reasons they wont run them as they are is because they are in First livery.... it gets as picky and political as that... unless the DfT force them to run them (which they should) (although i know there are 377s and 319s running around in FCC livery)...
There is a perfect diagram for them too.. The 06.38 LBG to Uckfield, 08.04 Uckfield to LBG, 09.30 LBG to Selhurst Depot. (timings are just off the top of my head.).. currently a 4 car, making that 4 car spare..or lengthening one of the other services. Fitting them in in the PM peak would be a bit more difficult cos of the limitations of Oxted Bay platform, there would need to be more jigging around with the formations.
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