The tunnel template script is comprised of two DGN files which for OpenBuildings Update 8 and later are in the folder:C:\ProgramData\Bentley\OpenBuildings CONNECT Edition\Configuration\WorkSpaces\Station_Examples\worksets\StationDesignerTemplate_NM\Standards\Seed\
For earlier versions they are in the Station Designer dataset extension in the path:C:\ProgramData\Bentley\OpenBuildings CONNECT Edition\Configuration\Datasets\DatasetExtensions\Station_Designer\Seed\
The first file contains the alignments and is referenced by the second file. This second file contains a script which places a tunnel liner, two layers of concrete ballast, and sleepers. The script file contains comments in the list of Transactions that provide additional information about the purpose of the respective subsequent sections of transactions.
The tunnel script uses a user-defined type "Tunnel Liner", placed as a BuildingContent node and replicated along the tunnel center alignment. It also uses a Cell "Sleeper", placed on the rail alignments. This contents is part of the dataset extension delivered with OpenBuildings Station Designer.