Southern Pacific Lines

Western
Region
Timetable

3

Sunday, October 29, 1989

WESTERN REGION

SPECIAL INSTRUCTIONS

Section H. PLACEMENT OF HELPER ENGINE:

1. A helper engine consist of not more than 8 axles, operating
or isolated may be placed behind a caboose.
EXCEPTION: Within the State of California, not more than one
                     locomotive operating or isolated may be placed
                     behind a caboose.

2. A helper engine not qualifying under Item 1 which weighs less
than 840,000 pounds may be placed anywhere in a train, but must
not exceed maximum trailing tonnage on ascending grade as shown
in Timetable, or be placed behind a caboose.

3. A helper engine which weighs more than 840,000 pounds must
be entrained to pull not less than 60% of the tonnage being handled
by that helper.

4. Helper engine must be entrained ahead of empty two-axle
intermodal cars.

5. METHODS FOR CALCULATING HELPER PLACE-
MENT AND TRAILING TONNAGE ON ASCENDING
GRADES:

(When necessary to relocate helper due to restrictive cars, helper
may be moved forward the minimum distance necessary, but must
not exceed the maximum trailing tonnage on ascending grades as
shown in the Timetable).

EXAMPLE 1: ONE ENTRAINED HELPER
Train tonnage                                   = 8,000 tons
Road horsepower                              = 2 EF636's =  7,200 hp
Helper horsepower                            = 3 EF636's = 10,800 hp
                                                Total horsepower = 18,000 hp

Determine Road Engine Tonnage:
  7,200 Road hp X 8,000 Train tonnage = 3,200 tons pulled by
18,000 Total hp                                     road engine

Determine Helper Placement:
10,800 Helper hp X 8,000 Train tonnage X 0.6 = 2,800 tons
  18,000 Total hp                                             (Location
                                                                      from rear of
                                                                      train)

EXAMPLE 2: ONE ENTRAINED HELPER AND ONE END
                    OF TRAIN HELPER
Train tonnage                                    = 10,000 tons
Road horsepower                              = 4 EF636's = 14,400 hp
Entrained helper horsepower              = 5 EF636's = 18,000 hp
End of train helper                             = 2 EF630's =   6,000 hp
                                                Total horsepower = 18,000 hp

Determine Road Engine Tonnage:
14,400 Road hp X 10,000 Train tonnage = 3,750 tons pulled
38,400 Total hp                                       by road engine

Determine End of Train Helper tonnage:
  6,000 Road hp X 10,000 Train tonnage = 1,562 tons handled
38,400 Total hp                                        by end-of-train
                                                               helper (shoving)

Determine Entrained Helper's Trailing Tonnage:
18,000 Helper hp X 10,000 Train tonnage X 0.6 = 2,812 tons
  38,400 Total hp                                               pulled by
                                                                        road engine

Determine Entrained Helper's Placement:
End of Train Helper Tonnage + Tons Pulled by Entrained Helper
= Entrained Helper Placement
1,562 + 2,812 = 4,374 tons from rear of train

EXAMPLE 3: MULTIPLE ENTRAINED HELPERS
Train tonnage                                       = 11,000 tons
Road horsepower                                  = 4 EF630's = 12,000 hp
First helper horsepower (swing)              = 6 EF636's = 21,600 hp
Second helper horsepower (rear)            = 2 EF636's =   7,200 hp
                                                    Total horsepower = 40,800 hp

Determine Road Engine Tonnage:
12,000 Road hp X 11,000 Train tonnage = 3,235 tons pulled by
40,800 Total hp                                       road engine

Determine Second Helper tonnage:
7,200 Helper hp X 11,000 Train tonnage = 1,941 tons handled
40,800 Total hp                                       by second helper

Determine Second Helpers Placement in Train:
1,941 X 0.6 = 1,165 tons from rear of train

Determine First Helpers Trailing Tonnage:
21,600 Helper hp X 11,000 Train tonnage X 0.6 = 3,494 tons
40,800 Total hp                                         pulled by first
                                                                helper

Determine First Helpers Placement in Train:
Tons Handled by Second Helper + Tons Pulled by First Helper =
First Helper Placement
1,941 + 3,494 = 5,435 tons from rear of train to first helper