Ballast and subgrade materials evaluation
By: M. R. Thompson.
Contributors: United States. Federal Railroad Administration. Office of Research and Development.
Series: Report - Federal Railroad Administration ; no. FRA/ORD-77-32; Report (National Institute of Standards and Technology (U.S.)) -- no. FRA/ORD-77-32.
Publisher: Dept. of Transportation, Federal Railroad Administration, Office of Research and Development; for sale by the National Technical Information Service
Published: 1977
Place of publication: Washington; Springfield, Va
Language: eng
Number of pages: 31
Subjects: Ballast (Railroads) -- Testing.; Railroads -- Track -- Testing.
Notes: Prepared by Dept. of Civil Engineering, University of Illionis at Urbana-Champagin, under contract DOT-FR-30038.

Interim report; December 1977.

Includes bibliographical references.