1923 Marmon Harrington (love their creations) the original road train, the Damascus to Bahgdad run

How this came to be is written up in an article http://www.saudiaramcoworld.com/issue/198104/the.nairn.way.htm in which the Nairn brothers found a need and filled it with a bus route between Syria and Damascus, cutting the 70 mile route in 1/3rd the time.

found on http://dieselpunk.livejournal.com/521142.html