The Florence–Rome railway is part of the traditional main north-south trunk line of the Italian railway network. The line is referred to by Ferrovie dello Stato (the State Railways) as the Linea Lenta (meaning "slow line", abbreviated LL) to distinguish it from the parallel high-speed line. The Linea Lenta is now mainly used for regional services, for the InterCity services — rather than the faster Eurostar Italia trains — between Florence and Rome and for the majority of freight trains. Some types of passenger train are routed on the line to serve smaller stations not served by the high-speed line or in order to improve traffic flow during peak periods or other periods of congestion.