1:50 TLM - NGA

MIL-T-89301A
“3.12.16 In mo~.
Roads in mountainous areas frequently contain sharp ‘o
(hairpin~”turns which must be represented without excessive scale
distortion.
b. To avoid excessive displacement, the turns are
symbolized with a common symbolized edge-line as each turn
back on itself.
is made
3.12.17 Woad c~. Railroads are classified and
symbolized as to gauge, number of tracks, whether operating or
non-operating, or electric.
a. Railroad track classification.
(1) A single track railroad has
(2) A double track railroad has
the same railroad.
one
two
set of tracks.
sets of tracks on
(3) A multiple track railroad has three or more sets of
tracks on t-he same raiiroad. The number of tracks is indicated by
labeling parallel to the symbol.
(4) The point of change in the number .of tracks is “
indicated by the prescribed symbol and is appropriately labeled as
●
close as possible to the point of change symbol.
(5) If two railroads are in juxtaposition, that is,
closely parallel but on separate roadbeds, each line is symbolized
individually. If the distance between the roadbeds is too narrOw.
to plot to scale, the space is exaggerated to 3.0 mm.
b. Operating railroads.
(1) An operating railroad is one that is at least in
limited use over a maintained, permanent right-of-way.
(2) Monorails, logging, cog, and decauville railroads
are considered permanent narrow gauge railroads.
(3) Portable type railroads, such as those used in cane
fields and in strip mininq, -. are not considered permanent railroads
and are not mapped-.
c. Non-operating railroads.
(1) A non-operating railroad
OE maintained.
s one chat is not in use
J2) Abandoned railroad. A railroad that is not in use
and the right-of-way is not maintained; however, the roadbed,
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