Bologna–Florence high-speed railway

The Bologna–Florence high-speed railway is a link in the Italian high-speed rail network. It is part of Corridor 1 of the European Union's Trans-European high-speed rail network, which connects Berlin and Palermo. Full commercial operations commenced on 5 December 2009. High-speed passenger trains take 37 minutes over the route compared to about 59 minutes previously.[2]

Bologna–Florence high-speed railway
Bologna-Stazione Centrale-DSCF7236.JPG
Bologna–Florence high-speed railway
Overview
StatusOperational
OwnerRete Ferroviaria Italiana
LocaleItaly
Service
SystemItalian high-speed rail system
History
Opened5 December 2009
Route map

91.478
Bologna Centrale
(underground level)
(6.433)
Bologna San Ruffillo
(5.205)
84.031
Bologna Passante tunnel
(exit)
83.763
Pianoro tunnel
(10,481 m)
(4.724)
Connecting tunnel*
(4.527)
signaling border
(0.206)
*
(0.206)
Pianoro tunnel
(entrance to connecting tunnel)
(0.000)
78.487
Emilia junction
72.920
Pianoro tunnel
(exit)
72.220
Sadurano tunnel
(3,855 m)
68.352
68.290
Monte Bibele tunnel
(9,243 m)
60.166
Idice crossover
59.047
52.920
Raticosa tunnel
(10,450 m)
48.341
48.268
Scheggianico tunnel
(3,558 m)
44.712
44.445
Firenzuola tunnel
(15,285 m)
43.834
San Pellegrino crossover
29.165
28.948
Borgo Rinzelli tunnel
(717 m)
28.231
27.323
Morticine tunnel
(654 m)
26.630
24.192
San Piero a Sieve crossover
29.165
Vaglia tunnel
(18,713 m)
5.611
Signaling boundary
5.442
5.372
Firenze Castello
2.766
Firenze Rifredi
to Faenza and Rome
(traditional and high-speed)
0.000
Firenze Santa Maria Novella
Source: Italian railway atlas[1]

The line's northern end is at Bologna Centrale railway station and it connects with the Milan–Bologna high-speed line and lines to Venice (Padua–Bologna railway) and Verona (Verona–Bologna railway), respectively. Its southern end is at Firenze Santa Maria Novella railway station and it connects with the Florence–Rome high-speed line. It is largely used by high-speed passenger trains, while the majority of goods trains have continued to use the old Bologna–Florence railway, known as the Direttissima. Since 2018, high speed freight services have also been run upon the line.[3]

HistoryEdit

BackgroundEdit

Prior to the construction of the Bologna–Florence high-speed railway, the existing Bologna–Florence railway, popularly known as the Direttissima, had been handling the majority of this traffic at a primary trunk route. This line, which had been completed in 1934, had been built as a superior alternative to the nineteenth century Pistoia–Bologna railway, providing both higher speeds and additional capacity to traffic.[4] However, by the 1980s, it was becoming clear that the capacity of both of these railways were becoming saturated, and that the existing infrastructure would not be able to accommodate much more growth in demand, particularly in light of changing operational circumstances. While capable for the era in which they were built, neither line conformed with the increasingly high standards of modern European railways, and there was a political desire for Italy's core railway network to be upgraded to these same standards to improve service levels and to better integrate with the continental high speed network.[4]

Even in light of this willingness to construct a new national high speed railway network, the Bologna-Florence route was recognised as posing particular difficulty.[4] The region's terrain had long challenged numerous civil engineers when building most forms of infrastructure, it directly confronted any effort to build a straighter railway (necessary for high speed operations), particularly the flatter gradients that were typically sought. As such, it was determined that the successful construction of the Bologna-Florence high speed line would constitutes the greatest design and construction commitment of the whole national network.[4][5]

ConstructionEdit

During 1992, Treno Alta Velocità (TAV), a special subsidiary of the Italian railway infrastructure company Rete Ferroviaria Italiana (RFI) was granted a concession for the design, construction and management of Italy's new high speed railway lines for a period of 50 years.[4] In turn, TAV selected several engineering companies as general contractors, performing the design and construction of these lines, including the Bologna-Florence section, which was allocated to FIAT Engineering S.p.A. and the CAVETconsortium, while Rocksoil S.p.A was appointed to design the line's extensive underground works. Environmental impact studies and the executive design phase commenced during early 1992, with TAV issuing the alignment's general design to FIAT.[4]

The geological surveys determined that fully mechanised tunneling was suited to some, but not all, locations.[4][6] Accordingly, the excavation methods used often varied between individual tunnels, which some requiring preparatory reinforcement along with other mitigatory measures in areas of instability or other challenging characteristics. Defined plans that conformed with ISO 9002 quality assurance systems were produced to guide the excavation phase of each area.[4] FIAT, the project's general contractor, accepted responsibility for all unforeseen events, including any geological factors. The construction phase commenced immediately following the awarding of a contract in July 1996.[4]

During October 2005, all excavation work, which included every tunnel section, was completed.[4] Three years later, construction of the railway's infrastructure, including the overhead electrification, was declared to be complete. Testing of the line commenced in December 2008. The railway was formally transferred over to TAV's control on 30 June 2009. The first commercial service to use the line was conducted on 4 December 2009, while the new high-speed railway was officially opened during the following day.[7]

While the cost of constructing the line had been estimated to roughly €1 billion (1991 values in lire converted to euros) at the project's start, it ultimately costed €5.2 billion (€67 million per kilometre, €108 million per mile) to complete.[8]

FeaturesEdit

The line is 78.5 kilometres (48.8 mi) long and includes 73.8 kilometres (45.9 mi) of tunnels, 3.6 kilometres (2.2 mi) on embankment or in cutting and 1.1 kilometres (0.68 mi) on viaduct.[8][9] From Bologna to Florence, the tunnels are:[2]

Maximum rock coverage over tunnels is about 600 to 700 metres (2,000 to 2,300 ft). All tunnels are double track. Each tunnel has an intermediate access from the surface about every 5 kilometres (3.1 mi), except the Vaglia tunnel, which instead has a parallel service tunnel for about half of its length.[citation needed]

Akin to the rest of Italy's modern high speed lines, the Level 2 of European Rail Traffic Management System (ERTMS) signalling system has been installed throughout. This was installed without any traditional fallback system, such as physical lineside signals, yielding considerable cost savings due to the reduction in trackside equipment required and along with an ongoing decrease in associated trackside maintenance costs. ERTMS enables a significant increase in traffic capacity over historic signalling counterparts.[10][11]

ReferencesEdit

  1. ^ Atlante ferroviario s'Italia e Slovenia [Italian and Slovenian railway atlas)] (1 ed.). Schweers + Wall. 2010. pp. 48, 52, 144, 145. ISBN 978-3-89494-129-1.
  2. ^ a b "The new high speed Bologna–Florence line" (PDF). Treno Alta Velocità. Archived from the original (PDF) on 3 March 2016. Retrieved 31 January 2009.
  3. ^ "High-speed freight train Italy hits the track on 7 November". railfreight.com. 2 November 2018.
  4. ^ a b c d e f g h i j "Appendix B: The design and construction of tunnels for the new Bologna-Florence high speed/capacity railway line" (PDF). link.springer.com. Retrieved 15 September 2020.
  5. ^ "High Speed Railway Bologna-Florence section". cmcgruppo.com. Retrieved 3 January 2021.
  6. ^ {Greco, M. and Foresta, M. (October 2010). "High speed railway line bologna-florence permanent-way construction in the long railway tunnels". pp. 863–880.CS1 maint: multiple names: authors list (link)
  7. ^ "Milano–Novara and Bologna–Firenze HSLs open". Today's Railways Europe. February 2010: 12. Cite journal requires |journal= (help)
  8. ^ a b "Bologne–Firenze HSL opens". Today's Railways Europe. March 2010: 36–39. Cite journal requires |journal= (help)
  9. ^ Bindi, R. and Jones, M. (April 2002). "Progress on the Bologna to Florence high speed railway line". pp. 112–114.CS1 maint: multiple names: authors list (link)
  10. ^ "ERTMS deployment in Italy" (PDF). ertms.net. Retrieved 2 January 2020.
  11. ^ "Bologna High Speed bypass Line equipped with Alstom signalling system". alstom.com. 14 June 2012.

External linksEdit