Super Tokkyū (スーパー特急) is the name given to the concept of building new high-speed narrow gauge (1,067 mm) railway lines in Japan to extend the Shinkansen network of high-speed lines.[1]
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The Super Tokkyū concept involves building new narrow-gauge lines along the routes of planned shinkansen lines. All infrastructure would be built to high-speed shinkansen standards with the facility to widen the lines to standard gauge (1,435 mm) in the future. Some reductions in journey times could be achieved using conventional trains running at faster than normal speeds, and total construction expenditure could be spread over a longer period.[1]
In 1991, the Super Tokkyū concept was formally planned to be used as part of the following three shinkansen extensions:[1]
These schemes were subsequently upgraded to full Shinkansen specification lines.
As of 2009, the Kyushu Shinkansen western route to Nagasaki is under construction using the Super Tokkyū system.[3]
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