Designated service
Designated service means exclusive operation of a locomotive under the following conditions:
(1) The locomotive is not used as an independent unit or the controlling unit is a consist of locomotives except when moving for the purpose of servicing or repair within a single yard area;
(2) The locomotive is not occupied by operating or deadhead crews outside a single yard area; and
(3) The locomotive is stenciled “Designated Service—DO NOT OCCUPY”.