diff --git a/server/src/board/tile/rail/signal/signal2aspectrailtile.cpp b/server/src/board/tile/rail/signal/signal2aspectrailtile.cpp
index dbfdf7cd..89a868f0 100644
--- a/server/src/board/tile/rail/signal/signal2aspectrailtile.cpp
+++ b/server/src/board/tile/rail/signal/signal2aspectrailtile.cpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -22,18 +22,18 @@
 
 #include "signal2aspectrailtile.hpp"
 #include "../../../../core/attributes.hpp"
-#include "../../../../utils/makearray.hpp"
+
+static const std::array<SignalAspect, 3> aspectValues = {SignalAspect::Stop, SignalAspect::Proceed, SignalAspect::Unknown};
+static const std::array<SignalAspect, 2> setAspectValues = {SignalAspect::Stop, SignalAspect::Proceed};
 
 Signal2AspectRailTile::Signal2AspectRailTile(World& world, std::string_view _id) :
   SignalRailTile(world, _id, TileId::RailSignal2Aspect)
 {
   outputMap.setValueInternal(std::make_shared<SignalOutputMap>(*this, outputMap.name(), std::initializer_list<SignalAspect>{SignalAspect::Stop, SignalAspect::Proceed}));
 
-  Attributes::addValues(aspect, makeArray(SignalAspect::Stop, SignalAspect::Proceed, SignalAspect::Unknown));
+  Attributes::addValues(aspect, aspectValues);
   m_interfaceItems.add(aspect);
-}
 
-void Signal2AspectRailTile::doNextAspect(bool /*reverse*/)
-{
-  aspect = (aspect == SignalAspect::Stop) ? SignalAspect::Proceed : SignalAspect::Stop;
+  Attributes::addValues(setAspect, setAspectValues);
+  m_interfaceItems.add(setAspect);
 }
diff --git a/server/src/board/tile/rail/signal/signal2aspectrailtile.hpp b/server/src/board/tile/rail/signal/signal2aspectrailtile.hpp
index 1faeead5..3b21dc29 100644
--- a/server/src/board/tile/rail/signal/signal2aspectrailtile.hpp
+++ b/server/src/board/tile/rail/signal/signal2aspectrailtile.hpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -30,9 +30,6 @@ class Signal2AspectRailTile : public SignalRailTile
   CLASS_ID("board_tile.rail.signal_2_aspect")
   CREATE(Signal2AspectRailTile)
 
-  protected:
-    void doNextAspect(bool) final;
-
   public:
     Signal2AspectRailTile(World& world, std::string_view _id);
 };
diff --git a/server/src/board/tile/rail/signal/signal3aspectrailtile.cpp b/server/src/board/tile/rail/signal/signal3aspectrailtile.cpp
index e59073e8..fd6a8e5a 100644
--- a/server/src/board/tile/rail/signal/signal3aspectrailtile.cpp
+++ b/server/src/board/tile/rail/signal/signal3aspectrailtile.cpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -22,39 +22,18 @@
 
 #include "signal3aspectrailtile.hpp"
 #include "../../../../core/attributes.hpp"
-#include "../../../../utils/makearray.hpp"
+
+static const std::array<SignalAspect, 4> aspectValues = {SignalAspect::Stop, SignalAspect::ProceedReducedSpeed, SignalAspect::Proceed, SignalAspect::Unknown};
+static const std::array<SignalAspect, 3> setAspectValues = {SignalAspect::Stop, SignalAspect::ProceedReducedSpeed, SignalAspect::Proceed};
 
 Signal3AspectRailTile::Signal3AspectRailTile(World& world, std::string_view _id) :
   SignalRailTile(world, _id, TileId::RailSignal3Aspect)
 {
   outputMap.setValueInternal(std::make_shared<SignalOutputMap>(*this, outputMap.name(), std::initializer_list<SignalAspect>{SignalAspect::Stop, SignalAspect::ProceedReducedSpeed, SignalAspect::Proceed}));
 
-  Attributes::addValues(aspect, makeArray(SignalAspect::Stop, SignalAspect::ProceedReducedSpeed, SignalAspect::Proceed, SignalAspect::Unknown));
+  Attributes::addValues(aspect, aspectValues);
   m_interfaceItems.add(aspect);
-}
-
-void Signal3AspectRailTile::doNextAspect(bool reverse)
-{
-  switch(aspect)
-  {
-    case SignalAspect::Unknown:
-      aspect = SignalAspect::Stop;
-      break;
-
-    case SignalAspect::Stop:
-      aspect = reverse ? SignalAspect::Proceed : SignalAspect::ProceedReducedSpeed;
-      break;
-
-    case SignalAspect::ProceedReducedSpeed:
-      aspect = reverse ? SignalAspect::Stop : SignalAspect::Proceed;
-      break;
-
-    case SignalAspect::Proceed:
-      aspect = reverse ? SignalAspect::ProceedReducedSpeed : SignalAspect::Stop;
-      break;
-
-    default:
-      assert(false);
-      break;
-  }
+
+  Attributes::addValues(setAspect, setAspectValues);
+  m_interfaceItems.add(setAspect);
 }
diff --git a/server/src/board/tile/rail/signal/signal3aspectrailtile.hpp b/server/src/board/tile/rail/signal/signal3aspectrailtile.hpp
index 079c7bd7..0d54db2d 100644
--- a/server/src/board/tile/rail/signal/signal3aspectrailtile.hpp
+++ b/server/src/board/tile/rail/signal/signal3aspectrailtile.hpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -30,9 +30,6 @@ class Signal3AspectRailTile : public SignalRailTile
   CLASS_ID("board_tile.rail.signal_3_aspect")
   CREATE(Signal3AspectRailTile)
 
-  protected:
-    void doNextAspect(bool reverse) final;
-
   public:
     Signal3AspectRailTile(World& world, std::string_view _id);
 };
diff --git a/server/src/board/tile/rail/signal/signalrailtile.cpp b/server/src/board/tile/rail/signal/signalrailtile.cpp
index 3887ac5c..865e7592 100644
--- a/server/src/board/tile/rail/signal/signalrailtile.cpp
+++ b/server/src/board/tile/rail/signal/signalrailtile.cpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -27,14 +27,10 @@
 
 SignalRailTile::SignalRailTile(World& world, std::string_view _id, TileId tileId) :
   StraightRailTile(world, _id, tileId),
-  name{this, "name", std::string(_id), PropertyFlags::ReadWrite | PropertyFlags::Store},
-  aspect{this, "aspect", SignalAspect::Unknown, PropertyFlags::ReadWrite | PropertyFlags::StoreState,
-    [this](SignalAspect value)
-    {
-      (*outputMap)[value]->execute();
-    }},
-  outputMap{this, "output_map", nullptr, PropertyFlags::ReadOnly | PropertyFlags::Store | PropertyFlags::SubObject},
-  nextAspect{*this, "next_aspect", [this](bool reverse){ doNextAspect(reverse); }}
+  name{this, "name", std::string(_id), PropertyFlags::ReadWrite | PropertyFlags::Store | PropertyFlags::ScriptReadOnly},
+  aspect{this, "aspect", SignalAspect::Unknown, PropertyFlags::ReadOnly | PropertyFlags::StoreState | PropertyFlags::ScriptReadOnly},
+  outputMap{this, "output_map", nullptr, PropertyFlags::ReadOnly | PropertyFlags::Store | PropertyFlags::SubObject | PropertyFlags::NoScript},
+  setAspect{*this, "set_aspect", MethodFlags::ScriptCallable, [this](SignalAspect value) { return doSetAspect(value); }}
 {
   const bool editable = contains(m_world.state.value(), WorldState::Edit);
 
@@ -48,8 +44,8 @@ SignalRailTile::SignalRailTile(World& world, std::string_view _id, TileId tileId
   Attributes::addDisplayName(outputMap, DisplayName::BoardTile::outputMap);
   m_interfaceItems.add(outputMap);
 
-  Attributes::addObjectEditor(nextAspect, false);
-  m_interfaceItems.add(nextAspect);
+  Attributes::addObjectEditor(setAspect, false);
+  // setAspect is added by sub class
 }
 
 void SignalRailTile::worldEvent(WorldState state, WorldEvent event)
@@ -60,3 +56,14 @@ void SignalRailTile::worldEvent(WorldState state, WorldEvent event)
 
   Attributes::setEnabled(name, editable);
 }
+
+bool SignalRailTile::doSetAspect(SignalAspect value)
+{
+  const auto* values = setAspect.tryGetValuesAttribute(AttributeName::Values);
+  assert(values);
+  if(!values->contains(static_cast<int64_t>(value)))
+    return false;
+  (*outputMap)[value]->execute();
+  aspect.setValueInternal(value);
+  return true;
+}
diff --git a/server/src/board/tile/rail/signal/signalrailtile.hpp b/server/src/board/tile/rail/signal/signalrailtile.hpp
index 3495a4f2..ffec7aa9 100644
--- a/server/src/board/tile/rail/signal/signalrailtile.hpp
+++ b/server/src/board/tile/rail/signal/signalrailtile.hpp
@@ -3,7 +3,7 @@
  *
  * This file is part of the traintastic source code.
  *
- * Copyright (C) 2020-2021 Reinder Feenstra
+ * Copyright (C) 2020-2022 Reinder Feenstra
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -38,13 +38,13 @@ class SignalRailTile : public StraightRailTile
 
     void worldEvent(WorldState state, WorldEvent event) override;
 
-    virtual void doNextAspect(bool reverse) = 0;
+    virtual bool doSetAspect(SignalAspect value);
 
   public:
     Property<std::string> name;
     Property<SignalAspect> aspect;
     ObjectProperty<SignalOutputMap> outputMap;
-    Method<void(bool)> nextAspect;
+    Method<bool(SignalAspect)> setAspect;
 };
 
 #endif
diff --git a/server/src/core/abstractvaluesattribute.hpp b/server/src/core/abstractvaluesattribute.hpp
index 2b4c2321..431bff2f 100644
--- a/server/src/core/abstractvaluesattribute.hpp
+++ b/server/src/core/abstractvaluesattribute.hpp
@@ -39,6 +39,15 @@ class AbstractValuesAttribute : public AbstractAttribute
     virtual int64_t getInt64(uint32_t index) const = 0;
     virtual double getDouble(uint32_t index) const = 0;
     virtual std::string getString(uint32_t index) const = 0;
+
+    inline bool contains(int64_t value) const
+    {
+      const auto l{length()};
+      for(uint32_t i = 0; i < l; i++)
+        if(value == getInt64(i))
+          return true;
+      return false;
+    }
 };
 
 #endif
diff --git a/server/src/core/attributes.hpp b/server/src/core/attributes.hpp
index 0c179834..27ada980 100644
--- a/server/src/core/attributes.hpp
+++ b/server/src/core/attributes.hpp
@@ -176,6 +176,12 @@ struct Attributes
     item.addAttribute(AttributeName::ObjectList, id);
   }
 
+  template<class R, class T, size_t N>
+  static inline void addValues(Method<R(T)>& method, const std::array<T, N>& values)
+  {
+    method.addAttribute(AttributeName::Values, values);
+  }
+
   template<typename T, size_t N>
   static inline void addValues(Property<T>& property, const std::array<T, N>& values)
   {