p 129 of _Main Lines_: In Britain, Freightliner "had a cost edge over highway for any movement over 150 miles, and had the edge for shorter hauls when available roads were especially congested, as between London and Southampton. BR contemplated shifting all residual carload freight to Freighliner and abandoning classification yards." It would perhaps have been clear to state the cost/benefit in travel-time terms, rather than miles. Then you don't need the congestion exception, since the time taken... read more
