sentences:  The Coal Trunk-Line was constructed by order of the Polish Government by a private company, the French-Polish Rail Association (FPTK – Francusko-Polskie Towarzystwo Kolejowe).This company maintained the route Herby – Gdynia from April 24, 1931, until September 1, 1939.During that time, the line was not under the authority of the Polish State Railways (PKP), the FPTK directed it from its headquarters in Bydgoszcz.