5.4. COALBURNING STEAM LOCOMOTIVES
To determine the quantity of coal required for steam
locomotives, use the formulas given in subparagraphs a and b below.
a. Road engines.
TD x 2 x LD = TMPD x FCF + 2,000 = STON per day x 30 = STON
per month + 10% = total coal required for road engines
where:
TD
=
train density
2
=
twoway travel
LD
=
length of division
TMPD
=
train miles per day
FCF
=
fuel consumption factor
2,000
=
pounds per ton
30
=
number of days in a month
b. Switch engines.
SE x 20 x FCF = pounds per day x 30 = pounds per month + 2000
= STON per month + 10% = total coal required for switch
engines
where:
SE
=
total switch engines required
20
=
average hours per day in operation
FCF
=
fuel consumption factor
30
=
average days per month
10%
=
reserve factor
5.5. OILBURNING STEAM LOCOMOTIVES
The method for determining the quantity of fuel required for
oilburning steam locomotives, both road and switch, is the same as
that for coalburning locomotives. However, only 5 percent is added
to allow for contingencies because the losses in heat energy are less
when using fuel oil than when using coal.
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