+ return objects.get<Track>();
+}
+
+template<>
+const set<Signal *> &Layout::get_all<Signal>() const
+{
+ return objects.get<Signal>();
+}
+
+template<>
+const set<Vehicle *> &Layout::get_all<Vehicle>() const
+{
+ return objects.get<Vehicle>();
+}
+
+template<>
+const set<TrackChain *> &Layout::get_all<TrackChain>() const
+{
+ return track_chains.get();
+}
+
+template<>
+const set<Block *> &Layout::get_all<Block>() const
+{
+ return track_chains.get<Block>();
+}
+
+template<>
+const set<Route *> &Layout::get_all<Route>() const
+{
+ return track_chains.get<Route>();
+}
+
+template<>
+const set<Zone *> &Layout::get_all<Zone>() const
+{
+ return track_chains.get<Zone>();
+}
+
+template<>
+const set<Sensor *> &Layout::get_all<Sensor>() const
+{
+ return sensors.get<Sensor>();
+}
+
+template<>
+const set<TrackCircuit *> &Layout::get_all<TrackCircuit>() const
+{
+ return sensors.get<TrackCircuit>();
+}
+
+template<>
+const set<BeamGate *> &Layout::get_all<BeamGate>() const
+{
+ return sensors.get<BeamGate>();
+}
+
+template<typename T>
+T *Layout::pick(const Ray &ray)
+{
+ const set<Object *> &objs = objects.get();
+ for(set<Object *>::const_iterator i=objs.begin(); i!=objs.end(); ++i)
+ if(T *t = dynamic_cast<T *>(*i))
+ if(t->collide_ray(ray))
+ return t;