Curved tall steel trestle bent angle

[jwar]

Making the Keddie trestle, have the hi line side done then noticed the Spanish creek side, it apears that the bents on the outside of the curved bridge may have more of an angle then the inside of the curve. Have made two trips up the canyon this year and spent a few hours on what I want to model, never noticed a difference in angles on my pictures, however a UP calender its more appearent, is this my eyes or what.

My question, if the inside and outside bent angles are different, on curved trestle bents, how much 5, 10 degrees ?

Seems I have read it somewhere, the ole grey matter is leaking...I guess.
Thanks in advance...John