Railroad steels and what they mean?

[ApprenticeMan]

Please what does ASTM A66 mean? How about

ASTM:

A1
A2
A3

ASTM A759


Thanks.

[Glenn]

ASTM A66
Specifications ASTM A66-87
Tensile Strength 60,000 PSI
Yield Point 0.5 Tensile Strength
Elongation in 2 in. Min. 18%

ASTM A1
This specification covers carbon steel tee rails of nominal weights of 60 lb/yd (29.8 kg/m) and over for use in railway track, including export and industrial applications.

ASTM A2
A2-02 Standard Specification for Carbon Steel Girder Rails of Plain, Grooved, and Guard Types

ASTM A3
This specification covers steel joint bars for connecting steel rails in mine, industrial, and standard railroad track.

ASTM A759
This section covers carbon steel crane rails of special designs and nominal weights of 104, 105, 135, 171, and 175 lbs./yard for crane runway use.

Reference www.google.com