RULE 37. (a) Overtime. Except where exercising seniority rights from one assignment to another, all time worked in excess of 8 hours continuous service in a 24-hour period shall be paid for as overtime on the minute-basis at 3/16ths of the daily rate per hour, according to class of engine.

(b) An engineer required to double, who is unable to complete the second shift because of the Hours of Service Law, will be allowed actual time worked on the second shift at the time and one-half rate plus pay at straight-time rate for up to 8 hours from the time first commencing to double.

(1) This rule applies only to service paid on an hourly or daily basis and not to service paid on mileage or road basis.

(2) A tour of duty in road service shall not be used to require payment of such overtime rate in yard service. (The term "road service," as used in this Paragraph (2), shall not apply to employes paid road rates, but governed by yard rules.)

(3) Where an extra man commences work on a second shift in a 24-hour period he shall be paid at time and one-half for such second shift except when it is started 22-1/2 to 24 hours from the starting time of the first shift.

A 24-hour period, as referred to in this rule, shall be considered as commencing for the individual employe at the time he started to work on the last shift on which his basic day was paid for at the pro rata rate.

(4) An extra man changing to a regular assignment or a regularly assigned man reverting to the extra list shall be paid at the pro rata rate for the first 8 hours of work following such change.

(5) Except as modified by other provisions of this rule, an extra employe working one shift in one grade of service and a second shift in another grade of service shall be paid time and one-half for the second shift, the same as though both shifts were in the same grade of service, except where there is another man available to perform the work at pro ratae rate.