Strait Tunnel
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| Construction started: | planned for 1746 AN |
| Construction finished: | planned for 1752 AN |
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| Country: |  Çakaristan
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| Constituent railways: |
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| Construction works done by: | Under tendering |
The Strait Tunnel Project is a dream project of the Shahanshah to further connect the nation. It connects the states of Kendall Khanate and Sylfystan. The tunnel will be 69.5 km long under the Jaris Strait.
On the south side, the Sylfystan connection will be realised from the existing rail link between Kuriabad and Tiren. A shuttle station to let road traffic on special commuter trains. Then an 18-km bridge to Speer Island. At Speer Island, the bridge merges into the Strait Tunnel to return above ground 69.5 km north. On the northern side, there will also be a shuttle station and the track will be connected to the planned high-speed railway line to Çatalyokuş and Lyzij.
The design consists of three tubes, two tubes with one track each, diameter 7.9 metres, and between them an escape and service tube with a diameter of 4.8 metres. At one-third and two-thirds of the tunnel length, there are switches and connecting tracks between the two main tubes. This allows accidents in one of the six sections to still keep the other five sections in operation. There are escape routes between the service tube and the rail tubes every 375 metres and vent connections every 200 metres.
The tracks are to be built in dual gauge: 1,435 mm (4 ft 8 1⁄2 in) and 1,676 mm (5 ft 6 in). This makes it suitable for the planned high-speed line between Agra and Çatalyokuş, the Apollonian Express and for freight trains to and from Manbai. On both sides of the tunnel there will be a marshalling yard and turning loops. These turning loops will allow shuttle trains to turn around quickly.
Engineers argue that Wechua concrete is the best material to build the tunnel safely and sustainably. However, this does not appear to be a requirement in the published tender documents, which caused a stir in various media. This, in addition to the fact that in early 1746 AN, a contractor had still not been selected.
