Can someone help me figure out all the different interiors Electrostars have?
Regarding 377s, 377/2s that I use all the time have the nice 2+2 with tables seating in the end carriages and the hard, uncomfortable 3+2 seating in the centre coaches. From what I've seen /5s are the same and /3s have the nice 2+2 throughout.
/1s and /4s are confusing me though - I've seen examples with all 2+2, all 3+2 and the combination you see on the /2s. Can anyone clarify this?
I have no idea about 375s but I've experienced two different interiors there too.
Obviously /6s and /7s have the 387 ironing board seating because they're not really 377s at all.
Also, is there any reason different interior specs were ordered? Are they assigned to services in any particular way?
Thanks!
Well, I am unfamiliar with the 375s, but I will certainly fill you in about the 377s!
377/1:
377 101-119: 2+2, padded and very comfortable seating throughout. Due to the design of the grab rails, there are no separating doors in first class. These units were ordered by Connex, prior to Govia winning the franchise in 2003;
377 120-139: 3+2, ironing board seating between the first door and the second door (where you would board/alight the unit) throughout, with the 2+2 padded and comfortable seating between the second door and interconnecting door throughout. Again, there are no separating doors in first class. These units were also ordered by Connex;
377 140-164: 2+2, relatively padded and relatively comfortable 2+2 seating in the leading and trailing coaches, with the 3+2, ironing board seating in the middle two coaches. Again, no separating doors in first class as this was yet another Connex batch;
NOTE(S): Units numbered 377 101-139 underwent a massive interior refresh a few years ago, updating them from their previous Southeastern-like livery to a more Govia-inspired livery (like what you would see in any other Southern unit, barring the 442s, of course!). The first class seating in all three specifications are the padded 2+2 design. Also, not relating to the interior design, but the front and back facing lights on units numbered 377 101-139 (as well as the 377/3s) are much smaller than all of the other 377s.
377/2:
377 201-215: Identical to units numbered 377 140-164 in that they have the 2+2 seating in the leading and trailing coaches and the 3+2 seating in the middle two coaches, however these units do have separating doors included in both first class sections. These units were ordered by Govia.
NOTE(S): Again, not relating to the interior design in any way, but, as these units were built to be able to run on both AC and DC power, there is a pantograph fitted on each 377/2 spec unit above either coach 2 or coach 3 (depending on which way the train is going!). Units numbered 377 207-215 are currently on loan to Thameslink (and work alongside 377/5s) until all of the new stock (the 700s) are in service.
377/3:
377 301-328: These units have a completely identical interior and exterior to the 377/1s, numbered 101-119. The only difference is that the /3s are formed of 3 coaches as opposed to 4. These units were also ordered by Connex before Govia won the franchise in 2003.
NOTE(S): These units were actually converted from Southeastern 375s (originally numbered 375 311-338). The main change was that the couplers were changed from Tightlock to Dellners.
377/4:
377 401-475: These units are all identical to the 377/2s, just without the pantograph above the second/third coach. All of these units were ordered by Govia once they had taken over the Connex franchise.
NOTE(s): Units 377 472 and 474, if you didn't already know, were involved the record breaking speed run between London Bridge and Brighton. There was previously branding on the exterior of both units (and, I think, a couple of posters dotted around inside), recognizing this achievement. However, this was removed back in 2014 during an overhaul.
377/5:
377 501-523: These units are completely identical to the 377/2s. As previously mentioned, they currently used for Thameslink services, although, once the 700s are in service, will be moving to Southern to provide extra capacity. These units were all ordered by Govia, originally in order to provide more capacity on Southern (which, as mentioned above, will soon be the case).
NOTE(S): Some 377/5s are running with the new Thameslink logo.
377/6 & 7s:
377 601-626 & 701-708: The /6s and /7s both have the ironing board seating throughout, just like the 387/1s and /2s (I'm not completely sure of the seating layout, nor about the first class areas). I think there has been some confusion amongst passengers and staff alike about first class, especially, on these units. The main difference between the two subclasses is that the /7s have pantographs above coach number 3 in order for them to run on AC power as well as DC, and the /6s don't. All of these units are formed of 5 coaches and were ordered by Govia in order to replace the 456s and to provide extra capacity (in the 377/7s case, on the West London line).
NOTE(S): Because of the aforementioned confusion about where first class is situated in these units, GTR decided to paint a traditional yellow marker above, with the words 'first class' on the side, just like all of the other 377s. I have no idea why this wasn't the case anyway!
I hope this does tell you what you wanted to know! Hopefully, someone will be able to get back to you regarding the Southeastern units.
EDIT: Apologies, it has taken me such a long time to write all of the above that I've only just seen that someone else has already beaten me to it! I need to be quicker!!
Richard
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377121 - 139 have the 2+2 seating in the DMOS and 3+2 in the PTSOL and TSO and the old headlight clusters (Connex spec)

Sorry to be pedantic.
You've forgotten to put 377 120 into that category! Also, the seating arrangement is every so slightly different to how you've described it: the 3+2 seating features in every coach, just in the middle of it (i.e. between the first and second doors). There is then the 2+2 seating at the front/rear of each coach (i.e. between the second door and the interconnecting door). What you described is more applicable to units numbered 377 140-164, the /2s, the /4s and the /5s (minus the old headlights, of course!).