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AREMA lateral deflection limits

AREMA lateral deflection limits

AREMA lateral deflection limits

(OP)
In the Arema Manual for Railway Engineering commentary, it states that "The lateral deflection limits recommended are 50% of the FRA allowable limits for alignment deviation for Class 5 Track. Therefore, at least 50% of the allowable limit remains to account for variations in track alignment, rail wear and track fastener wear or movement."

My questions are:

Is the deflection limited to 50% of Class 5, even if I have Class 3 track?

If not, can I follow their metric and use 50% of class 3 allowable as specified by FRA?

Are these deflection limits applicable only for tracks-on-grade or can they be applied to tracks on elevated structure? (We are analyzing class 3 elevated tangent tracks)


I've looked at AREMA and FRA websites and have tried to find documentation that would answer my questions, but I have not found much. I'm hoping someone here can shed some light on this issue.

Thanks in advance.

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