Back to the London, Brighton and South Coast for these later, larger updated versions of the lavatory non-corridors, the "balloon" stock with its distinctive roof profiles, carrying the later "Edwardian" white and umber livery. Fitting one extra compartment's worth of passengers at slightly a slightly higher comfort rating, these carriages are a good update to the earlier LBSCR stock in this thread, although, being heavier, one might find that one needs a larger locomotive to pull them: the LBSCR "L" class Brighton Baltic type already included in Pak128.Britain courtesy of The Hood is the perfect locomotive for these carriages, which, although non-corridor, were used on the LBSCR's express trains from London to Brighton and survived well into Southern Railways days. This set includes a mail-carrying full brake.
.dat and .png files attached, English translation texts below:
LBSCR-balloon-full-brake
LBSCR "Balloon" carriage (full brake)
LBSCR-balloon-brake-front
LBSCR non-corridor lavatory "Balloon" carriage (brake)
LBSCR-balloon-brake-rear
LBSCR non-corridor lavatory "Balloon" carriage (brake)
LBSCR-balloon
LBSCR non-corridor lavatory "Balloon" carriage
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To answer SDog's question, the answer is not entirely clear as the word "corridor" was used at different times to mean slightly different things. It can refer either (and more correctly) to a corridor down the side of a carriage whereby passengers from different compartments in the train may access other compartments and (more importantly) lavatories in the same carriage, or to what is more correctly called a "gangway": a connector between carriages.
Most corridor carriages were also gangwayed, but some early examples were not, and the corridor was present just to enable passengers to access the lavatory. The traditional British side-corridor carriage indeed consisted of a number of different separate compartments containing (usually) two facing rows of seats with a corridor down one side. This evolved from the non-corridor compartment coach (with the carriage split into many different compartments, each inaccessible to the other, with a pair of facing rows of seats with anything up to six passengers on each row), which in turn evolved from the stage coach, as the first railway carriages were essentially two stagecoach bodies mounted on a railway truck underframe.
Unlike in the US, the open carriage (without compartment partitions) was slow to evolve in the UK, first appearing in the 20th century, and not really taking hold (with the exception of urban metro networks) until after the second World War (although some companies, such as the LMS, did build quite a few open carriages for their longer distance work in the late 1920s and early 1930s).
To complicate matters further, many gangwayed corridor carriages still had outside doors to every compartment, as this enabled faster loading and unloading than the more modern vestibule approach, although the latter produced a more comfortable travelling environment. In Pak128.Britain, the SR Maunsell carriages, the GWR toplight carriages and the GWR "express" carriages were of the "all doors" type (in addition to the LSWR carriages above), while the LNER "teak" carriages, the LMS standard carriages, the SR Bulleid carriages are vestibuled corridor types.
Note also that the non-corridor compartment carriage with no interconnexion between the compartments at all remained popular throughout the first half of the 20th century, and a little way beyond until displaced by open types, for short-distance, suburban traffic, as the carriages could absorb far more passengers than the corridor design, and short distance passengers require less in the way of amenity (it is supposed) than passengers who have to remain for several hours in the same vehicle. The LSWR compartment carriages and the later BR Mk. I suburban carriages of which you are very fond of using in your most recent game are both of this non-corridor type (hence their lower comfort rating: passengers have no access to a lavatory, for example). Most inner suburban EMUs before the 1960s also used this style, including the LSWR EMUs, the SR 3-Subs, the SR 4-Subs, the SR 4-Lav (apart from the centre coach, which had a side corridor (but no gangway) and a lavatory; you will see that the comfort rating of that carriage is higher than the others in the train!), and the BR 2- and 4-EPBs as well as the class 319.
For further reading, see the fascinating and delightfully well-written, "The History of British Railway Carriages 1900 - 1953" by David Jenkinson, ISBN 1-899816-03-8.