That border re-opened in 1951, but the closure of the Bulgarian–Turkish border from 1951 to 1952 prevented services running to Istanbul during that time.
Perbatasan tersebut dibuka kembali pada 1951, tetapi penutupan perbatasan Bulgaria-Turki sejak 1951 hingga 1952 menghambat jalannya operasi ke Istanbul pada waktu itu.