You can create a new InformationLayer in code behind and set its Reader property to the "readerRail" object of type SqlGeospatialDataReader(). Then you can add the InformationLayer to the Items collection of your map.
var readerRail = new Telerik.Windows.Controls.Map.SqlGeospatialDataReader();
var infLayer = new InformationLayer();
infLayer.Reader = readerRail;
In addition, you can take a look at the SQL Geospatial Data
help article in our documentation where the SqlGeospatialDataReader object is further described.
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