Championship in the 1945–46 season, finally finishing 4th. After this season the club returned to its old name, CFR (Căile Ferate Române – Romanian Railways), and entered in the 1946–47 Divizia A season, the first official national season after the end of the war, ending 5th, two points away from the second place (Carmen București) and 13 from the 1st place (ITA Arad). In the following season, 1947–48, the team finished 3rd, behind CFR Timişoara and ITA Arad. In the 1948–49 season "the White and Burgundies" finished 2nd at only five points behind IC Oradea. Also on 20 March 1949, CFR București obtained the biggest victory in its entire history, 12–2 against CFR Cluj. The 1950s started with a change of the system format, from the autumn-spring to the spring-autumn one, as an influence of the communist regime installed in the country after 1945. In the 1950 season Rapid became Locomotiva, a name much closer to the Soviet version, Lokomotiv, change imposed for all the teams that belonged to the Romanian Railways, but Giuleștenii finished again on the 2nd place. The first relegation came in 1951 when the club was ranked 11th, losing to the goal difference, a fight in three, against Locomotiva Târgu Mureș and Știința Timișoara. Promoted one year later, from the first place, with 10 points over the second-ranked (Locomotiva Iași), would finish the 1953 season in 5th place. In 1954 season Locomotiva relegated for the second time, occupying the 12th place. "The White and Burgundies" returned however after only one year in the Divizia A, following a good period for the team including a 4th-place ranking at the end of 1956, only 5 points behind the first position (CCA București). From the 1957–58 season, the Romanian football returned to the autumn-spring system and "the Railwaymen" finished at the middle of the table, 8th, out of 12. The end of the Soviet system meant also the end of the Soviet names and in 1958 they returned to the Austrian inspired name of Rapid. In the following years the team finished 4th and 10th at the end of the 1958–59 and 1959–60 seasons. In the 1950s the squad included following players: V. Stănescu, Gh. Dungu, Gh.Demeter, D. Macri, I.Mihăilescu, C.Simionescu, N.Cristescu, I.Ruzici, C.Socec, I.Lungu, B. Marian, A.Rădulescu, A.Ferenczi, Şt. Filotti, N.Roman, E.Avasilchioaie, D.Călin, L.Coman, A.Todor, N.Dodeanu, I.Langa, I.Olaru, S.Zeană and Gh.Milea, among others. The 1960s was one of