to Kozani, but the project was abandoned in 1932 due to lack of funds. The Greek railway system (both infrastructure and rolling stock) suffered serious damages during World War II (especially in 1943–1944) and did not become fully operational until 1950. However the viaduct of Achladokampos in Peloponnese, destroyed in 1944, was rebuilt only in 1974. In 1960 the line from Larissa to Volos, of the former Thessaly Railways, was converted to standard gauge and was connected in Larissa with the line from Athens to Thessaloniki. New station buildings were constructed in Thessaloniki (known as Thessaloniki New Passenger Station or ΝΕΣΘ) (1952), Larissa (1962), Lianokladi (1950), Sindos, Aiginio, Platamon, Florina, Edessa, Agras, Arnissa, Polykastron, Ptolemais and Kozani. Rolling stock Until 1962 the Hellenic State Railways used a variety of steam locomotives from various sources. Some of them belonged to the pre-1920 networks, a number were acquired as part of foreign aid programs after the war and a small number was procured. Conversion to diesel traction began in the early 1960s. The first diesel locomotives were delivered in 1962 and included 30 Krupp Y60 shunters (Class A-101), 10 ALCo DL532B (Class A-201) and 10 ALCo DL500C (Class A-301). They were followed by classes A-221, A-321, A-351, A-401 and A-411 for the network and classes A-9101, A-9201 and A-9401 for the networks. Diesel multiple units were first introduced in 1936 and became more common in the 1950s and 1960s. Steam locomotives were slowly phased out but were still in limited use in December 1970. Steam locomotives The following table shows steam locomotives acquired by the Hellenic State Railways between 1920 and 1969. They also continued to use an assortment of older types of locomotives inherited from the previous Greek and Ottoman railway companies. Diesel locomotives (standard gauge) Diesel locomotives (metre gauge) Diesel multiple units The Hellenic State Railways bought their first DMUs in 1936 and acquired larger numbers in the 1950s. Additional metre gauge multiple units were inherited from networks absorbed in SEK. See also Railways of Greece Hellenic Railways Organisation References and notes It is the only extensive and authoritative source for the history of Greek railways. Further reading Contains brief history, simple line maps and extensive list of rolling stock until 1997. Defunct railway companies of Greece Government-owned companies of Greece Railway companies established in 1920 Railway companies disestablished in 1970 1970 disestablishments in Greece Greek companies established in 1920