The route feature class (Polyline with M feature class).
[Visual Basic 6.0] Property RouteFeatureClass As IFeatureClass
[Visual Basic .NET] Public ReadOnly Property RouteFeatureClass As IFeatureClass
[C#] public IFeatureClass RouteFeatureClass {get;}
[Java] public IFeatureClass getRouteFeatureClass() throws IOException, AutomationException
[C++] HRESULT get_RouteFeatureClass( IFeatureClass** routeFClass );