To recall: "Doubling the hill" is an alternative to using a helper.  Part of the train is hoisted up the hill and stashed where convenient (on a siding).  The power returns downhill and then hoists the remainder up the hill.  The train is re-assembled.  

At your option you may wish to have the conductor, with his caboose, work both trips.   You can picture that the process is plainly a "time consuming" job with lots of fun bits.

In ProTrak you can schedule "doubling".  See "Scheduling, Doubling the ruling Grade".   Select the train for which you want to schedule doubling.  A new window opens, listing the train, the number of units assigned and the train-length in "cars" - and each segment of the train-job's trip.   For each segment you will see: the yard siding number, the grade "base station", the ruling grade - the calculated estimated train capacity in cars - and the number of cars that would need to be doubled.   Click the checkbox for a segment to be doubled.

During operations, ProTrak will move the actual locomotive's "capacity" number of cars up the hill to crest siding or yard.  The cars to be doubled remain at the base of the grade (siding or yard).   When the train is reported at the crest (or the station beyond the crest siding) all the cars are moved (within the program) to that yard.

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Update 359 made some corrections to this scheduling and car movements.  (If it is of interest this section was last examined in 2003.)

            Jim