William O. Douglas,
United States v. Carolina Freight Carriers Corporation…
“ By § 208 (a) the certificate must specify 'the service to be rendered' by the carrier. As we have noted, a 'common carrier by motor vehicle' was defined in § 203 (a) (14) as one who 'undertakes' to transport 'passengers or property, or any class or classes of property, for the general public'. That definition is the same for irregular and regular route carriers. It is plain that a carrier's holding out and actual performance may be limited to a few articles only. That is to say he may be a common carrier only of a restricted number of commodities. ”
