 On 6 May 1916 the branch line Genazzano-Fiuggi was opened for service.From Rome to Fiuggi trips lasted two hours and 45 minutes, but service was frequent, with a train departing every half hour.The Fiuggi-Alatri-Frosinone and Fiuggi-Vico nel Lazio-Guarcino branch lines were opened for service on 14 July 1917.