PFC Lokomotiv Plovdiv teams are the most supported ones in the second largest city in Bulgaria. Botev is one the country's oldest teams, whereas Lokomotiv grew popular in the 70s. Traditionally, Lokomotiv drew support from the lower working classes of society whereas Botev drew support form the middle and upper classes, although that no longer applies. Another rivalry Lokomotiv Plovdiv has is with one of Bulgaria's most successful football clubs - CSKA Sofia. The rivalry has a geopolitical nuance, first because of the historical competition between the cities of Plovdiv and Sofia as cultural, political and economical centres, and second because of the
PFC Lokomotiv Plovdiv prestigious tournaments. By 1944 the team is the biggest in the region of Plovdiv in terms of members, and has a dedicated following with its fans setting records for the period in attendance of football matches. In the mid-1930s the labour union of the railway workers and sailors establishes several cultural and sporting organisations across the country. The railway workers established their sports club in Plovdiv as well, since the city is one of the major travel centres in the country. On 13 June 1935 the club "ZSK Plovdiv" was founded, abbreviated from "Zheleznicharski Sporten Klub Plovdiv" meaning "the sporting