Rail Truck Hybrid and Urban Congestion

This topic is based on an earlier thread concerning urban road congestion, intermodal facilities, truck traffic etc. I was then on another website and saw that a manufacturer for model trains had a street system incorporating tracks which guided trucks down a street. Then I thought, hmmm…what about the opposite situation, which brought to mind the displacement of track speeders with flange mounted rail trucks with rubber tires…why not then a delivery truck? This would avoid the age old problem of dedicated transfer facilities…take traffic off the roads…etc.

Then I found this…http://www.lankelma.co.uk/site_pages.php?page=UK12&tohere1=rigs

Interesting concept thats a variation on a theme…could this design be adapted for freight haulage? Would this work, particularly in urban areas, or on lightly used lines? I kept coming back to that great belt line…the EJ&E… hmmm…