So, about the excursion cars..., which are a very mysterious case (DO NOT READ, in case you don't want to leave a bit dizzy from the forum...

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We are sure that in 1930-something 52 freight cars were converted to excursion cars, numbers Θτ 801-820, 821-850, 851 (Bar) and 861, and it's a fact that 100% sure they were converted from RINGHOFFER ''Ζτ''s ... Proofs ??
a) a SEK list, written around 1945 has the number matchings from Ζτ to Θτ, according to which, ALL of the "Θτ"s were Ζτ (no Ητ mentioned).
b) Some photos exist showing the ''Θτ'' which are 100% simillar with the Original "Ζτ"s and NOT with the "Ητ"s. (the convertion is some opened windows, a fance instead of the classic door, and fences at the car's edge to allow the passengers to pass from one car to another).
c) Some drawings .... such as that :
which show a Ζτ and not an Ητ.
christo wrote:The following is just my theory:
SEK converted the Ητ livestock carrying wagons 8601-8612 (Athens Region) and 8613-8650 (Salonica Region) made by Ringhoffer in Czechoslovakia in 1926/7 into excursion carriages, sometime before WWII. These Ητ wagons were the only ones with 6.5m distance between the axles in the Greek stock list of the time. Also they had a characteristic V strengthening support on the underframe. The leaf springs were obviously replaced to passenger type instead of goods wagon type.
Also, Christo ... unfortunately we can not agree with your theory because :
a) What you say is that ALL of the "Ητ"s were converted to excursion cars... BUT it is known that we have other cars converted from "Ητ"s as well ... for example Ζτ and Φτ and also some "Ητ"s were scrapped without being converted (many years ago).
b) in the ~1945 freight car list
ALL OF THE "Ητ"s ARE REFERRED TO AS ACTIVE.
On the other hand AFTER the W.W. II we surely had some more convertions...!
Θπτ 961-963 converted by MCi - 43 (Thanks to Andreas for the type info) German wagons which were left in Greece (λάφυρα) ... such as that :
(photo 1990 by M. Kougioumtzoglou - Θπτ 962 at Amalia)
Some more cars converted from ΚΟΝΤΡΑ ΠΛΑΚΕ vans (plywood vans by U.N.R.R.A., American built 1942-1944 by A.C.C., G.A.T.C. and P.-S.C.M. CO.) with numbers further than Θπ 851 and also around 913-925 many of which ended up like that:
... which is ex- Θπ 925.
Finally after W.W. II some more ex- "Ζτ"s are mentioned continuing the numbers further than 861.
My personal theory, is that during W.W. II some of the ex- "Ζτ"s were destroyed and / or lost ("αφαιρεθέντα") and as soon as they needed those cars (otherwise they wouldn't convert any of the above [RINGs, Plywoods and ex- German]) they replaced the destroyed "Ζτ"s with new convertions from "Ητ"s which were not used due to the 25 Italian H2 livestock wagons built by O.M.S.S.A. in 1951 (if the convertion of the Hs was after then), taking their numbers (Θπτ 801-850).
It's true that what has remained as Θ in our days, they are all ex- "Ητ"s like that one at Edessa which was posted above...
... which is initially Ηπτ 8613 (if my theory is true, it has replaced Ζτ 7226), later as Θπτ 818 and since 1974 when it was given to the Track Maintenance sector of Thessaloniki as 30 73 100 7 229-2.
Finally again, some of the after- W.W. II converted "Ζτ"s and a very small number of the pre W.W. II ones came back (around 1970) to its original form as Z1 / Ζτ with an UIC number and were mixed with our known series ... as 20 73 107 7 8... and 9... (the last wagons of the series), of course having changed a bit due to their multiple convertions...
Example :
Initially Ζτ 7054, later Θτ 894 and finally as Z1 20 73 107 7 895-7 at Lianokladi ...
Note :
a) the new door without the characteristic "X" (as we said their original doors had been replaced by a fence while they were "Θ"s)
b) the handbrake at the braking hut which was changed to a round and vertical one.