The AREA Manual is revised annually and the user shall refer to the current
edition, which can be verified by contacting the AREA at: 50 F Street, N.W.,
Washington, D.C. 20001. Manual owners receive revision notices yearly. AREA
references in this chapter of MIL-HDBK-1005/6 are keyed to the 1990 AREA
Railroad Car Curvature Standards. Minimum curvature negotiability
standards for railroad cars appear in Section 2.1, Design Data, Association of
American Railroads (AAR) - Mechanical Division, Specifications for Design,
Fabrication and Construction of Freight Cars, Volume 1.
Federal Railroad Administration (FRA) Track Safety Standards. The
Code of Federal Regulations (CFR) Title 49 Part 213 - Track Safety Standards
prescribe minimum safety standards which may be used by maintenance personnel.
Under these standards tracks are classified as Class 1, 2, 3, 4, 5, or 6
wherein the maximum allowable speed limits for freight and passenger trains
are assigned to each class. If a segment of track does not meet all the
conditional requirements for its intended class it is classified to the next
lowest class for which it does meet all the requirements. The FRA Track
Safety Standards "prescribes initial minimum safety requirements for railroad
track" and shall be used for safety inspections only. They are not to be used
for design purposes or as construction inspection criteria.