Sharing 3 'Rare' to 'Very Rare' Railroad Agent Markings. One in cover, 2 on piece. I included Simpson's description and rarity guide for reference - but to be sure, and with this particular situation I can prove it, Simpson didn't have access to them all. Between my examples, and the tracings provided by Simpsons, Towles, & Remele - These are not as 'Rare' or 'Extremely Rare' as Thomas Alexander thought. Don't get me wrong - they are still 'Very Rare' and you would be lucky to find one in the wild. Original auction description for the cover included. Other examples on piece were found by me in the wild.
(Louisa and Virginia Central Railroad) Virginia Central R.R., Sep 16. Bold route agent cds ties 3˘ dull red (11A) on blue folded cover to Charlotte C.H., Va.; some extra CDS ink, F.-V.F. and exceptionally rare, Rarity IX. Towle No. 303-B-2
September 16th circa 1852 east on Route 2429 to Richmond for transfer via Burkesville to Charlotte Court House.
Simpson's lists this cancel as Tracing #377 - Rarity 9 (2-3 known) His tracing being dated NOV 16
I could have written more about these, and provided Remele's and Towles' images - but time is short, and home life beckons.
Here are a few images for your entertainment & enjoyment. All stamps have both inner lines recut. None have been plated.
Front of SEPT 16 Folded Cover (no contents)

Closeup of Stamp and "VIRGINIA CENTRAL RR" Railroad Agent Marking

Back of SEPT 16 Folded Cover (for the sake of completeness)

JAN 4 "VIRGINIA CENTRAL RR" Railroad Agent Marking on piece (Partial) (Simpson Tracing 377):

DEC 4 "VIRGINIA CENTRAL RAILROAD" Railroad Agent Marking on piece (complete) (Simpson Tracing 376)

Simpson's listing of the two slightly different "Virginia Central RR" railroad Agent Markings -

Simpson's Rarity number definitions -

As always, from the collection of Stanley M. Shepp
~ Stan