diff --git a/pom.xml b/pom.xml
index 5bb06e6..ebf15e0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.srsoftware</groupId>
 	<artifactId>web4rail</artifactId>
-	<version>0.8.1</version>
+	<version>0.8.2</version>
 	<name>Web4Rail</name>
 	<packaging>jar</packaging>
 	<description>Java Model Railway Control</description>
diff --git a/src/main/java/de/srsoftware/web4rail/actions/ConditionalAction.java b/src/main/java/de/srsoftware/web4rail/actions/ConditionalAction.java
index 883ca89..ed547a5 100644
--- a/src/main/java/de/srsoftware/web4rail/actions/ConditionalAction.java
+++ b/src/main/java/de/srsoftware/web4rail/actions/ConditionalAction.java
@@ -60,7 +60,7 @@ public class ConditionalAction extends Action {
 	@Override
 	public boolean fire(Context context) throws IOException {
 		for (Condition condition : conditions) {
-			if (condition.fulfilledBy(context)) return fireActions(context);
+			if (condition.fulfilledBy(context) != condition.inverted) return fireActions(context);
 		}
 		return false;		
 	}
@@ -106,7 +106,7 @@ public class ConditionalAction extends Action {
 
 	@Override
 	public String toString() {
-		if (conditions.isEmpty()) return t("Invalid condition");
+		if (conditions.isEmpty()) return t("[Click here to add condition]");
 		StringBuffer sb = new StringBuffer();		
 		for (int i = 0; i<conditions.size(); i++) {
 			if (i>0) sb.append(t(" or "));
diff --git a/src/main/java/de/srsoftware/web4rail/conditions/Condition.java b/src/main/java/de/srsoftware/web4rail/conditions/Condition.java
index f6c67b7..3f45b7a 100644
--- a/src/main/java/de/srsoftware/web4rail/conditions/Condition.java
+++ b/src/main/java/de/srsoftware/web4rail/conditions/Condition.java
@@ -4,6 +4,8 @@ import java.util.HashMap;
 import java.util.Map;
 
 import org.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import de.keawe.tools.translations.Translation;
 import de.srsoftware.tools.Tag;
@@ -12,12 +14,17 @@ import de.srsoftware.web4rail.Constants;
 import de.srsoftware.web4rail.Plan;
 import de.srsoftware.web4rail.Window;
 import de.srsoftware.web4rail.actions.Action.Context;
+import de.srsoftware.web4rail.tags.Button;
+import de.srsoftware.web4rail.tags.Checkbox;
+import de.srsoftware.web4rail.tags.Form;
+import de.srsoftware.web4rail.tags.Input;
 
 public abstract class Condition implements Constants {
-
+	public static final Logger LOG = LoggerFactory.getLogger(Condition.class);
+	private static final String INVERTED = "inverted";
 	private static HashMap<Integer, Condition> conditions = new HashMap<Integer, Condition>();
-	
 	public abstract boolean fulfilledBy(Context context);
+	public boolean inverted = false;
 	protected int id;
 
 	public Condition() {
@@ -65,8 +72,23 @@ public abstract class Condition implements Constants {
 		String json = new JSONObject(Map.of(REALM,REALM_CONDITION,ID,id,ACTION,ACTION_PROPS,CONTEXT,context)).toString().replace("\"", "'");
 		return new Tag(tagClass).clazz("link").attr("onclick","request("+json+")").content(toString());
 	}
+	
+	public Tag propForm(HashMap<String, String> params) {
+		Form form = new Form("condition-props-"+id);
+		new Input(REALM,REALM_CONDITION).hideIn(form);
+		new Input(ACTION,ACTION_UPDATE).hideIn(form);
+		new Input(ID,id).hideIn(form);
+		new Input(CONTEXT,params.get(CONTEXT)).hideIn(form);
+		return form;
+	}
 
-	protected abstract Window properties(HashMap<String, String> params);
+	protected Window properties(HashMap<String, String> params) {
+		Window win = new Window("condition-props", t("Properties of {}",getClass().getSimpleName()));		
+		Tag form = propForm(params);
+		new Checkbox(INVERTED, t("inverted"), inverted).addTo(form);
+		new Button(t("Apply"),"return submitForm('condition-props-"+id+"');").addTo(form).addTo(win);
+		return win;
+	}
 	
 	public static String t(String text, Object...fills) {
 		return Translation.get(Application.class, text, fills);
@@ -77,5 +99,8 @@ public abstract class Condition implements Constants {
 		return t("invalid condition");
 	}
 
-	protected abstract Object update(HashMap<String, String> params);
+	protected Object update(HashMap<String, String> params) {
+		inverted = "on".equals(params.get(INVERTED));
+		return t("updated {}.",this);
+	}
 }
diff --git a/src/main/java/de/srsoftware/web4rail/conditions/TrainSelect.java b/src/main/java/de/srsoftware/web4rail/conditions/TrainSelect.java
index df552fc..eb1cb37 100644
--- a/src/main/java/de/srsoftware/web4rail/conditions/TrainSelect.java
+++ b/src/main/java/de/srsoftware/web4rail/conditions/TrainSelect.java
@@ -4,12 +4,9 @@ import java.util.HashMap;
 
 import org.json.JSONObject;
 
-import de.srsoftware.web4rail.Window;
+import de.srsoftware.tools.Tag;
 import de.srsoftware.web4rail.actions.Action.Context;
 import de.srsoftware.web4rail.moving.Train;
-import de.srsoftware.web4rail.tags.Button;
-import de.srsoftware.web4rail.tags.Form;
-import de.srsoftware.web4rail.tags.Input;
 import de.srsoftware.web4rail.tags.Label;
 
 public class TrainSelect extends Condition {
@@ -33,23 +30,16 @@ public class TrainSelect extends Condition {
 	}
 	
 	@Override
-	protected Window properties(HashMap<String, String> params) {
-		Window win = new Window("condition-props", t("Properties of {}",getClass().getSimpleName()));
-		String formId = "conditional-props-"+id;
-		Form form = new Form(formId);
-		new Input(REALM,REALM_CONDITION).hideIn(form);
-		new Input(ACTION,ACTION_UPDATE).hideIn(form);
-		new Input(ID,id).hideIn(form);
-		new Input(CONTEXT,params.get(CONTEXT)).hideIn(form);
+	public Tag propForm(HashMap<String, String> params) {
+		Tag form = super.propForm(params);
 		Train.selector(train, null).addTo(new Label(t("Select train:")+NBSP)).addTo(form);
-		new Button(t("Apply"),"return submitForm('"+formId+"');").addTo(form).addTo(win);
-		return win;
+		return form;
 	}
-	
+
 	@Override
 	public String toString() {
-		if (train == null) return super.toString();
-		return t("Train = {}",train);
+		if (train == null) return t("[Click here to select train!]");
+		return t(inverted?"Train ≠ {}":"Train = {}",train);
 	}
 	
 	private TrainSelect train(Train train) {
@@ -65,6 +55,6 @@ public class TrainSelect extends Condition {
 		Train train = Train.get(tid);
 		if (train == null) return t("No train with id {} found!",tid);
 		this.train = train;
-		return t("Updated condition");
+		return super.update(params);
 	}
 }