RULE 5. MULTIPLE-UNIT DIESEL LOCOMOTIVES. All units of a diesel-electric locomotive in all road services which are connected one with another by control cables shall be considered one locomotive when in charge of one engineer, and the rate of pay shall be determined by the weight-on-drivers of all units so connected and in charge of one engineer, even though one or more of the connected units of the diesel locomotive are inoperative.

NOTE: This rule shall not be construed to mean that engineers in charge of helper or doubleheader engines shall be paid the combined weight-on-drivers of all units pulling the train because the engineer on the lead locomotive controls the air brakes, etc.

In yard service, the rate of pay shall be determined by the combined weight-on-drivers of the maximum number of connected units of the locomotive in charge of one engineer which are operative and in use at any one tin* during the shift or day's work.