[modeleng] Elevated track systems

       I have question for the British contingent about elevated track
structures.        What's been the most popular pier design?  Built-up
piers or imbedded posts?  When erecting masonry or concrete support piers,
what if anything is done to provide a base or footing?  Is a poured or laid
footing laid first and the piers erected on these, or do the piers tend to
rely upon their own footprint for support?  No doubt the answer to the
first varies with location and substrate.
      What is a typical length of say a concrete span?  Do builders tend to
pour these in place or pour them on the ground and then lift them into
place?  Any information would be welcomed.


Regards,
Harry Wade
Nashville  Tennessee

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