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List of transport megaprojects 
Summary
This is a list of megaprojects. Care should be taken in comparing the cost of projects from different times, even a few years apart due to inflation; comparing nominal costs without taking this into account can be highly misleading.
According to the Oxford Handbook of Megaproject Management in 2017, "Megaprojects are large-scale, complex ventures that typically cost $1 billion or more, take many years to develop and build, involve multiple public and private stakeholders, are transformational, and impact millions of people".[1]
Completed projectsEdit
Under constructionEdit
ProposedEdit
| Project | Description | Location | Approximate cost (in billions USD) | Proposed start of construction | Proposed year of completion | Notes |
|---|---|---|---|---|---|---|
| Great Istanbul Tunnel | Railway, Undersea tunnel |  Istanbul
|
$3.5bn[110] | TBD | TBD | After Marmaray and Eurasia Tunnel's, it will be the third tunnel to connect Istanbul's sides. |
| Arctic Railway | Railway |  Finland,  Norway
|
3.31[111] | TBD | TBD | A connecting line between Kirkenes port and the Finnish railway network. |
| Bridge of the Horns | Bridge |  Djibouti,  Yemen
|
20 | TBD | TBD | A bridge across the Red Sea. |
| Crossrail 2 | Railway, Commuter rail, Rapid transit |  Greater London, United Kingdom
|
31.2[112] | 2023 | 2030s[112] | A new railway line in England, serving London, Surrey & Hertfordshire to interlink with Crossrail (above). |
| Helsinki City Rail Loop | Railway tunnel | Finland
|
1.71[113] | TBD | TBD | An underground rail loop in Helsinki. |
| Helsinki–Tallinn Tunnel | Railway, Undersea tunnel | Finland,  Estonia
|
17.13[114] | 2020 | 2024[115] | |
| Irish Sea Bridge | Bridge | United Kingdom
|
19.15[116] | TBD | TBD | A proposed bridge between Scotland and Northern Ireland, supported by the Johnson ministry.[117] |
| Lentorata | Railway tunnel | Finland
|
6.28[118] | TBD | TBD | An airport rail link for Helsinki Airport. |
| Malacca Strait Bridge | Bridge |  Indonesia,  Malaysia
|
14[119] | TBD | TBD | A proposed 48 kilometer bridge over the Strait of Malacca. |
| Saudi–Egypt Causeway | Causeway |  Saudi Arabia,  Egypt
|
4 | TBD | TBD | |
| Strait of Messina Bridge | Bridge |  Italy
|
6.6 | TBD | TBD | |
| Sunda Strait Bridge | Bridge | Indonesia
|
18.87[120] | TBD | TBD | The project has been indefinitely postponed.[121] |
| Singapore Strait crossing | Undersea tunnel |  Singapore, Indonesia
|
TBD | TBD | TBD | A proposed tunnel between Singapore and Indonesia. |
| Suburban Rail Loop | Mass transit |  Australia
|
35.76-71.52[122] | 2022 | 2050 | A proposed extension of the Melbourne rail system. |
| Qatar–Bahrain Causeway | Causeway |  Qatar,  Bahrain
|
5 | TBD | TBD | |
| Brightline West | High-speed rail |  USA
|
8[123] | 2020 | 2024 | |
| Texas Central Railway | High-speed rail | USA
|
5.9 | 2021 | 2026 | |
| Ontario Line | Rapid transit |  Canada
|
7.3-8.7[124] | TBD | TBD | 16 km, 15 stop line with at-grade, elevated and underground sections operated with driverless trains.[125] |
Airport projectsEdit
ReferencesEdit
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