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Inspired by the sleds used to test supersonic planes and spacecraft, the teams are challenged to build a superfast railway... but all usual forms of propulsion are banned.
On TV
First Shown
| Date | Time | Channel |
|---|---|---|
| Sunday 10 May 2009 | 1.20PM | More4 |
Last Shown
| Date | Time | Channel |
|---|---|---|
| Saturday 22 August 2009 | 3.55AM | Channel 4 |
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