We keep hearing about how vital the small amount of extra (standing) capacity the 700 interior provides, however this of course overlooks one of the big fails of the Thameslink Programme, namely the failure to provide for any lengthening on both the Welwyn and Hertford routes.
Likewise most of the Baldock/Royston 365 services happen to run into the main station at Kings Cross, yet due to short platforms at Baldock, Knebworth and Welwyn North they remain limited to 8 cars. SDO wouldn’t immediately help here due to the reversing berth at Baldock.
There is a lot more standing room available in the 700s although sadly this is achieved by
a) Reducing the number of seats, and
b) By reducing the allowance of standing room per person from 0.45 sqm to 0.25 sqm of floor space!
The following piece makes interesting reading and it will be interesting to see how 21st May pans out....
https://www.railfuture.org.uk/article1616-Standing-room-only
This extract makes the point:
"A 12 car class 700 has a claimed capacity of 1754 passengers. However it only has 666 seats, compared to 798 seats on the 12-car class 377 trains currently used between Brighton and Bedford. The reason that the claimed capacity is so high, beside the reduction in the number of seats, is that the standing allowance has been changed; whereas 0.45 sq. metres of floor space is allowed per person standing on existing trains, on the new Thameslink class 700 trains the standing allowance is being reduced to 0.25 sq. metres of floor space per person. To put that in perspective, on a class 700 twenty-seven people will be crammed into the same area as the back of a Mercedes Sprinter LWB van, compared to fifteen people on an existing train."