This dimension groups a mode of transport with the other modes that share its basic technology, rail transport with other forms of guided land transport, for example. Wikipedia describes rail transport as "a mode of transport using wheeled vehicles running on tracks, which usually consist of two parallel steel rails," a shared mechanical family even when the specific railway differs. Browsing by mode family keeps technologically related modes together.
Facts
Comparison
Era of Emergence Mode Family
Sources
1. Wikipedia: Rail transport
WikipediaRail transport, first steam-powered journeyQuote, Rail transport, first steam-powered journey
On 21 February 1804, the world's first steam-powered railway journey took place when Trevithick's unnamed steam locomotive hauled a train.
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