Code of Federal Regulations Title 49. Transportation § 49.236.787a Railroad

(a) Commuter or other short-haul railroad passenger service in a metropolitan or suburban area and commuter railroad service that was operated by the Consolidated Rail Corporation on January 1, 1979;  and

(b) High speed ground transportation systems that connect metropolitan areas, without regard to whether those systems use new technologies not associated with traditional railroads;  but does not include rapid transit operations in an urban area that are not connected to the general railroad system of transportation.