Abstract
Remarks are made on rail seat loading, the effect of speed, bending moments for ties in tangent track, dynamic considerations, and curved track. Although reflection of moments occurs under dynamic loading, full reflection does not occur under heavy loads. The authors suggestion that concrete ties be designed with a uniform prestressed section of constant cross-sectional area seems unjustified. A shallower section at tie center enables better utilization of materials in a prestressed concrete tie. It is noted that Amtrak recently awarded a contract for manufacturing over a million concrete ties to be installed on 400 track miles of the Northeast Corridor Improvement Program.
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