From FHWA
One of the major external factors
that changed local highway demands was the widespread introduction of
unit train rail in the Great Plains in the 1970’s and 1980’s.
Terminal and subterminal elevators were constructed on railroad
mainlines. These facilities drew grain from greater distances; both
from farms and smaller elevators. Increasing concentration within the
elevator industry has affected local truck traffic patterns.
Branch-line abandonment is another
railroad system change that has altered local highway demands. A
substantial portion of the railroad system has disappeared from the
Great Plains and Midwest since 1965. The percentage reductions in
state railroad miles have been computed from data contained in AAR
fact books. Iowa, Minnesota, and South Dakota have been impacted the
most. Over 40% of the railroad networks of each state have disappeared
since 1965. More than a third of the rail networks in Missouri,
Montana and Nebraska also have disappeared. After abandonment,
elevators must truck grains to markets, or mass-ship grains to rail
stations located on mainlines.
Losses in
Railroad Service from 1965 to 1995
|
STATE |
PERCENT LOSS OF RAIL MILES |
| |
|
|
Iowa |
49.27% |
|
Illinois |
29.65% |
|
Kansas |
29.67% |
|
Missouri |
35.35% |
|
Minnesota |
40.21% |
|
Montana |
-33.55% |
|
Nebraska |
-35.57% |
|
North Dakota |
-20.17% |
|
South Dakota |
45.695% |
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When analyzing the effects of traffic diversion, it is first necessary
to determine how many trucks are required to haul the capacity of a
rail car. Most grain moves in two rail car types: a 100-ton covered
hopper car (with a gross weight of 263,000lbs) and a 286,000-pound
covered hopper car which can typically accommodate 111 tons of wheat.
This graph shows the number of equivalent
trucks of each type needed to transport 100 tons of wheat.
|
TYPE OF TRUCK |
# of Trucks to Replace One
Railcar |
| |
|
|
Single Unit Tandem Axle |
6.7 |
|
Single Unit Tridem Axle |
5.2 |
|
Combination Five Axle |
3.5 |
|
Rocky Mountain Double |
2.7 |
In the 1997 Truck Size and Weight
Study, Draft Report, FHWA estimated marginal cost indexes for
combination trucks operating on several classes of rural highways.
Also, note that
the user fees paid by trucks cover only 90 percent of the damage cost
those trucks impose on the Federal Highway System. The
Federal-Aid Highway System is only 25 percent of the highway and road
system. Most transportation economists believe that trucks pay only 60
to 67 percent of the costs they impose upon the entire road system.
The marginal pavement
cost of the combination truck is about four times greater on a
minor rural arterial highway than on a rural interstate. The marginal
pavement cost of the combination truck is about 13.5 times greater on
a major rural collector highway than on a rural interstate.
Furthermore, the marginal pavement cost of the combination truck is
about 21 times greater on a minor rural collector highway than on a
rural interstate.
Changes in agricultural transportation
patterns will continue to impact the local highway system in the 21st
century and will focus more attention on the problems and issues
associated with this component of the agricultural transportation
infrastructure. Although local highway issues are sometimes obscured
by high-profile transportation problems, a cost effective rural road
system is still a prerequisite for the efficient movement of
agricultural commodities from farms to elevators and processing
plants.
From:
Federal Highway Administration Highway cost Allocation Study of
1997
Truck Size and Weight Study, Draft Report, FHWA
Denver Tolliver 7/27/98 - NDSU
UGPTI
So the next time that you think you
shouldn't get involved in saving a rail line, think again! - DepotNews
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