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diff --git a/include/G4Interface.h b/include/G4Interface.h
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+/**
+ * Copyright (C) 2009
+ * The IceCube collaboration
+ * ID: $Id: G4Interface.h 149388 2016-08-18 21:50:04Z jgonzalez $
+ *
+ * @file G4Interface.h
+ * @version $Rev: 149388 $
+ * @date $Date: 2016-08-18 22:50:04 +0100 (Thu, 18 Aug 2016) $
+ * @author Tilo Waldenmaier
+ */
+
+#ifndef _TOPSIM_G4INTERFACE_H_
+#define _TOPSIM_G4INTERFACE_H_
+
+#include <g4-tankresponse/g4classes/G4BeamTestRunManager.h>
+#include <icetray/I3Logging.h>
+
+#ifdef G4VIS_USE
+class G4VisManager;
+#endif
+
+class I3Particle;
+class G4BeamTestTank;
+class G4BeamTestDetectorConstruction;
+
+/**
+ * Top-level class to handle Geant4. All global things are initialized here (run manager, visualization manager, detector construction, physics list and user actions).
+ */
+
+class G4Interface
+{
+ public:
+  G4Interface(const std::string& visMacro="");
+  ~G4Interface();
+
+  //  Static method which returns the singleton pointer to this class
+  static G4Interface* GetInstance() {return g4Interface_;}
+
+  /// Add a tank to the geometry. Should not be called after initialized.
+  void InstallTank(G4BeamTestTank* tank);
+
+  /// Initialize event. Most Geant4 global things are initialized the first time this is called.
+  void InitializeEvent();
+  /// To be called after simulating each IceTray event.
+  void TerminateEvent();
+  /// Simulate a single particle (InitializeEvent must be called first)
+  void InjectParticle(const I3Particle& particle);
+
+ private:
+  void Initialize();
+
+  static G4Interface* g4Interface_;
+
+  G4BeamTestRunManager runManager_;
+
+#ifdef G4VIS_USE
+  G4VisManager* visManager_;
+#endif
+
+  G4BeamTestDetectorConstruction* detector_;
+  bool initialized_;
+  bool eventInitialized_;
+  std::string visMacro_;
+
+  SET_LOGGER("G4Interface");
+};
+
+#endif