. Efficient railway operation . Area of Head, sq. in : Web, . Base, 4^ Total, Ratio Periphery Head to Area Head Web Web Base Base Ratio Total Periphery to Total Area Moment of Inertia Section Modulus—Head • Base 554 APPENDIX V III. Continued. Rail Sections op American Railway Enginebkinq Association Section Recommended for Approval — — A 90 Area: Head = sq. in. . qroot Web =;;;;...::::::::: S% Total =8!82 \ \ \ iMn<y Moment of Inertia ■ • . ^-^/o Section Modulus—Head 12 56 ,, IK oq Ra
. Efficient railway operation . Area of Head, sq. in : Web, . Base, 4^ Total, Ratio Periphery Head to Area Head Web Web Base Base Ratio Total Periphery to Total Area Moment of Inertia Section Modulus—Head • Base 554 APPENDIX V III. Continued. Rail Sections op American Railway Enginebkinq Association Section Recommended for Approval — — A 90 Area: Head = sq. in. . qroot Web =;;;;...::::::::: S% Total =8!82 \ \ \ iMn<y Moment of Inertia ■ • . ^-^/o Section Modulus—Head 12 56 ,, IK oq Ratio M. I. to Area • • . lo.^ Ratio Sec. Mod. to Area ■......., i 40 APPENDIX V 555 A. R. Rail Sections — ContinuedSection Recommended for Approval—-A. R. A.— 100 lb.
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