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By general (if not book) definition a center siding is connected to both main lines, i.e., if you say "center siding" to someone, they would recognize you're talking about a siding that lies between the two main lines connected to both, usually with an equilateral turnout on the siding itself leading to hand-throw main line turnouts, and spring switches on the two leaving turnouts off the main tracks.  There are some instances where there is a siding between the double track that is connected to only one of them, but almost invariably this occurs in a location where the two main tracks are widely separated for  reasons of local topography. Note that a center siding has a dual function; it's also the crossover between the main tracks.S. Hadid
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