a. Gage.
(1) Normal gage is the gage used on the majority of the mainline railroads of a country. Normal gage in the United States is standard (4' 8½") gage.
(2) Broad gage is any gage greater than the normal gage used in a country.
(3) Narrow gage is any gage lesser than the normal gage used in a country.
(4) Either the symbol legend in the margin or labeling on the map identifies the gage of the railroads.
b. Multiple-Track Railroad. A multiple-track railroad contains three or more mainline tracks paralleling each other. The number of tracks of a multiple-track railroad is indicated by labeling placed parallel to the symbol.
c. Nonoperating Railroad. A nonoperating railroad is one not in use. Included in this category are railroads under construction, abandoned railroads, and destroyed railroads. Labeling placed parallel to the symbol indicates whether the line is abandoned, destroyed, or under construction.
(1) An abandoned railroad is one which is no longer in use, but the ballast, bridges, and tracks remain in major part and could be put into limited or full operation with a minimum of repair.
(2) Only those railroads on which actual work is under way are symbolized as under construction. Proposed lines are not shown. An operating line some times has additional tracks under construction. The symbol for the operating line is shown with appropriate labeling to indicate the construction.
d. Dismantled Railroad. A dismantled railroad is one which is no longer in use and which has the major part of its tracks and bridges removed. If the right-of-way is being used as a road only, the proper road symbol will be shown. If there is no road and the feature is of landmark importance, it is symbolized by a dashed line and labeled.
e. Electrified Railroad. Electrified railroads are shown by the proper symbol indicating the gage and number of tracks, with the word Electrified added parallel to the symbol.
f. Developed Areas.
(1) Minor line and sidings sometimes are omitted in congested areas. Through lines are always shown.
(2) Railroads which run underground for long distances in a city are not shown. The dashed lines indicating tunnels are omitted. Only the headwalls and wings of the tunnel entrances are shown.
(3) Rapid transit lines, when located in subways, are not shown. They are shown by the appropriate railroad symbol when located in open cut, on the surface, or on above-surface structures.
g. Symbols. The following contain the approved symbols for railroads and related features.
