in an upper part of the body; added windows to all side doors. From ET22-122 there was simplified and improved a suspension of the body, without transversal beams. From ET22-282, big headlights, typical for Polish railways, were fitted in conical covers instead of hexagonal. In 1973 Pafawag built a prototype passenger locomotive of the building type 201Ea, which had a different gear ratio for top speed 160 km/h, with no other substantial changes. The locomotive was classified as EP23-001, being a sole machine of this class. After a series of tests, the locomotive characteristics were found unsatisfactory and no more were built. In 1979 the prototype was rebuilt to ET22 standard and renamed ET22-121 in place of former locomotive 121 scrapped in 1977. Today this locomotive is conserved in Jaworzyna Śląska railway museum. Another two prototype locomotives were produced in 1978 as type 201Ec (also known as type 202E). Main changes introduced were an improved secondary suspension, multiple unit control and several small modernisations, like automatic door control. Wheelbase of bogies increased from 3,500 m to 3,800 m and they were connected with a linkage, but an overall wheelbase increased only by 0,08 m. Those locomotives were first given the numbers 501 and 502. As the production of ET22 continued, those were renumbered to 701 and 702 and finally to 1001 and 1002, which they carried until the end. A modernization was considered successful, but in a view of an economical crisis in 1980s in Poland, the authorities of a planned economy lost an interest in starting a production of an improved locomotive. In the 1980s PKP needed locomotives for passenger service. Since the freight service declined, the ET22 could be used for passenger service. They were fitted with main reservoir pipes required for the automatic door control of the passenger coaches. In 2004 the locomotive ET22-315 was modernised in ZNLE Gliwice and renamed ET22-2000 (201Em type). Main modifications affected the electrical and mechanical main components as well as the driver's cab which was equipped with a modern computerised control system and joysticks. The locomotive is painted in PKP Cargo colours. Moroccan E-1000 class The only locomotives of 201E family built for export were 23 modified units of 201Eg type for Moroccan railways ONCF, delivered in 1976. They differe in equipment and details, most noticeably they have single-part pantographs Faiveley. Initially they were meant to haul phosphorite trains from mountain