As used in this part,
(a) The Federal Aviation Administrator.
(b) The Federal Highway Administrator.
(c) The Federal Railroad Administrator.
(d) The National Highway Traffic Safety Administrator.
(e) The Federal Transit Administrator.
(f) The Administrator of the St. Lawrence Seaway Development Corporation.
(g) The Pipeline and Hazardous Materials Safety Administrator.
(h) The Maritime Administrator.
(i) The Research and Innovative Technology Administrator.
(j) The Federal Motor Carrier Safety Administrator.