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<a href="http://www.hoosactunnel.net/bore.php">http://www.hoosactunnel.net/bore.php</a>   Does this answer the question?  While not being a standard (little standardization was present in the early years of railroading), the dimensions were specified by the contract to build the tunnel. The website linked has a brief synopsis.  Builders of the Hoosac Tunnel (by Cliff Schexnayder, PE) is an excellent read, which goes into in depth information about the building of this tunnel.
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