Plovdiv reached an agreement that the Principality of Bulgaria and Eastern Rumelia had a common government, Parliament, administration, and army. Today 6 September is celebrated as the Unification Day and the Day of Plovdiv. After the unification, Plovdiv remained the second most populous city in Bulgaria after the capital Sofia. The first railway in the city was built in 1874 connecting it with the Ottoman capital, and in 1888, it was linked with Sofia. In 1892 Plovdiv became host of the First Bulgarian Fair with international participation which was succeeded by the International Fair Plovdiv. After the liberation, the first brewery
PFC Lokomotiv Plovdiv can be defined as that of "Sportclub Plovdiv" (being the fan-based team), and of club of the railway workers (being the team funded by the union). In the spring of 1922 the sport club "Karadzha" is founded administratively by the consolidation of some casual football teams in one of the districts of the city of Plovdiv so that the players can compete in the Championship of Plovdiv. Two years later, in 1924, the sport club "Atletik" is formed in the same district of Plovdiv as Karadzha. On 26 July 1926 the two sport clubs from the same district, Karadzha and