Italy (Friuli Venezia Giulia) - Lines with Obscure or Sparse passenger services
This list is based on the timetable in force until 12 December 2020. Although dated as 'from 14 June 2020' the timetable has been updated and reissued monthly since then. The current edition shows some trains as running for only a few months, but later updates may extend the period of operation. Users are recommended to check the Trenitalia website to ensure they are using the latest version.
Table numbers quoted here are from In Treno Tutt'Italia, the official Trenitalia timetable. Standard abbreviations are explained in General Information. Map references relate to the European Railway Atlas Regional Series and, in italic, to the Schweers+Wall Atlante ferroviario d’Italia e Slovenia.
Two useful symbols exist which show the booked route for trains not calling at a station: in the middle of the train column, a vertical bar "|" means that the train passes through the station without stopping, whereas a dot "." means that the train does not pass through that station but instead takes a different route.
Routes used occasionally for diversions
Overnight trains via Tarvisio are sometimes diverted via these two lines. This can be checked by looking at the northbound part of table 55 of In Treno, which shows Bologna to Venezia, with connections to Udine and Trieste. Look for trains passing through Portogruaro-Caorle, but not Udine. Udine and Trieste connections are not shown in the southbound part of the table, but it is normally the case that southbound trains will be diverted on the same nights as northbound ones.
These routes appear to be used on Saturday and Sunday nights until 12 December 2020 by the overnight trains between Roma and München.
Udine avoiding line: Tricesimo-S. Pelagio (PM Vat) - Buttrio
(154B3-153C3, 140D1, but not as shown) IT20/41
This route enables trains to run between the Tarvisio and Gorizia lines without reversing at Udine. The curve shown in the Atlante ferroviario d'Italia e Slovenia to Udine Parco scambio estremo lato Gorizia has been replaced by a spur east from the avoiding line to the Gorizia line.
Monfalcone avoiding line: Ronchi dei Legionari Nord - Ronchi dei Legionari Sud
(154C2, 27B2) IT20/42
This route enables trains to run between the Gorizia and Venezia lines without reversing at Monfalcone.