All there is the old K-Line Super Streets 3-rail now Williams by Bachmann EZ Street which is limited in range, but widely used. Most trolleys will only run on the D21 curves, D16 are too tight. There are diamond crossovers. Turnouts are coming soon, D21 only. There is lots of information in the forum and member Lee Willis has written books on Streets layouts and another on kit bashing Streets vehicles.
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