<prompt> Translate the following text to SwahiliAlthough many passenger lines have gone out of use as the railroad declined in importance, one line in particular has been kept in operation, primarily because it travels through some of the most beautiful countryside in Britain.  <response>: Ingawa mistari mingi ya abiria imekwisha kutumiwa wakati reli ilipopungua kwa umuhimu, mstari mmoja hasa umewekwa katika operesheni, hasa kwa sababu unapita kupitia baadhi ya maeneo mazuri zaidi ya mashambani nchini Uingereza. 