The previous diagrams illustrating the advancing time table authority of train No. 157 will now be used to explain the application of Rule 86.

Rule 86. Unless otherwise provided, an inferior train must be clear at the time a superior train in the same direction is due to leave the next station in the rear where time is shown.

A westward train that is inferior to and that is intending to run ahead of No. 157 must leave Deerfield at a time and proceed at a speed, not exceeding any maximum authorized speed, such that the last car of the train will be west of Lake Forest station before 2.54 pm., the leaving time of No. 157 at Deerfield.

For the above and all following diagram examples it is assumed that no train orders are in effect that supersede the time table authority of train No. 157.

Rules and special instructions effecting train No.157's time table authority to occupy the main track within yard limits at Deerfield and Lake Forest are ignored in order to simplify the diagrammatic explanation.

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