There are some train-routes that became legendary during the past. In former times they were real means of transportation for long-distance travel. Nowadays their main purpose is tourism. In some countries (e.g. Russia) they still are important parts of their transport systems.
... and Avestan.
The oldest form of Sanskrit is Vedic, in which the Vedas, the earliest Sanskrit texts, were composed. The earliest of the Vedas, the R^igveda, was composed ...