Most Standard corridors were officially 6 per compartment but the WR didn't have the folding armrest in all of theirs so they got 8 per compartment. I think a lot of WR ones were used on commuter services most of the time so this was fine but a little cramped on their weekend jaunt to the West Country! You could get 8 in the others if need be when you folded the arms up but reservations were always for 6.
I also remember the odd table for 4 in a compartment - couldn't be for 6 as it would have restricted access. From memory all compartments had the metal slots for tables but you didn't see them often.
MK 1 corridor stock was constructed with 8 compartments each holding 6 people, thus a designed seating capacity of 48.
Crush loading could be achieved with the armrests raised to achieve 8 per compartment equalling 64 persons.
The corridor did allow a much higher standing passenger crush loading, the normal calculation being 3 per compartment plus 8 at each end and 4 in the centre doorway, a total of 64 + 44 = 108. By comparison an open would accommodate about 2 1/2 per bay plus 6 at each end and 6 in the centre doorway when fitted, a total of 64 + 38 = 102
With regards to tables, in the late 60s and early 70s most compartments had folding tables which were located into hinge brackets at the bottom of the window. They lifted up with a leg which then dropped down onto the floor. In later years the tables were replaced with a small semi-circular shelf positioned under the window.
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I remember being on one in the 90's and someone was raped in the next compartment, none of us heard anything.
I remember in the 70s that the Southend Vic compartment stock used to become rolling passion wagons on the late night services.
Ahhh, memories of lovely blonde Essex girls in summer dresses, the smell of diesel, and the roar of 31s and 37s starting up on the blocks of the main line platforms, and the announcers...Straaatford, Illllford, Rommmmford, and all stations to Sarf End

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Happy days and memories of times much better.