diff --git a/pom.xml b/pom.xml
index df49a3f..a3bcd53 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.srsoftware</groupId>
 	<artifactId>web4rail</artifactId>
-	<version>1.1.7</version>
+	<version>1.1.8</version>
 	<name>Web4Rail</name>
 	<packaging>jar</packaging>
 	<description>Java Model Railway Control</description>
diff --git a/resources/translations/Application.de.translation b/resources/translations/Application.de.translation
index 76e0ca9..c433ee6 100644
--- a/resources/translations/Application.de.translation
+++ b/resources/translations/Application.de.translation
@@ -93,6 +93,7 @@ Left port\: : Port für links
 Length : Länge
 length\: : Länge:
 length\: {} : Länge: {}
+Length unit : Längeneinheit
 Locomotive manager : Lok-Verwaltung
 Locomotives\: : Lokomotiven:
 Manage cars : Waggons verwalten
@@ -160,6 +161,7 @@ Signals : Signale
 Simulating movement of {}... : Simuliere Fahrt von {}...
 Slower (10 {}) : 10 {} langsamer
 SOUTH : Süden
+Speed unit : Geschwindigkeits-Einheit
 Start actions : Start-Aktionen
 Stock ID : Inventarnummer
 Started {} : {} gestartet
diff --git a/src/main/java/de/srsoftware/web4rail/BaseClass.java b/src/main/java/de/srsoftware/web4rail/BaseClass.java
index 445c8af..91ddf05 100644
--- a/src/main/java/de/srsoftware/web4rail/BaseClass.java
+++ b/src/main/java/de/srsoftware/web4rail/BaseClass.java
@@ -15,6 +15,7 @@ public abstract class BaseClass implements Constants{
 	protected static Plan plan; // the track layout in use
 	public static final Random random = new Random();
 	public static String speedUnit = DEFAULT_SPEED_UNIT;
+	public static String lengthUnit = DEFAULT_LENGTH_UNIT;
 	private static final char[] HEX_CHARS = "0123456789ABCDEF".toCharArray();
 	public static Button contextButton(String context,String text) {
 		String[] parts = context.split(":");
diff --git a/src/main/java/de/srsoftware/web4rail/Constants.java b/src/main/java/de/srsoftware/web4rail/Constants.java
index b8a27b5..7205a50 100644
--- a/src/main/java/de/srsoftware/web4rail/Constants.java
+++ b/src/main/java/de/srsoftware/web4rail/Constants.java
@@ -52,6 +52,7 @@ public interface Constants {
 	public static final String  CONTACT = "contact";
 	public static final String  CONTEXT = "context";
 	public static final String  DEFAULT_SPEED_UNIT = "km/h";
+	public static final String  DEFAULT_LENGTH_UNIT = "mm";
 	public static final String  DISABLED = "disabled";
 	public static final String  GITHUB_URL = "https://github.com/srsoftware-de/Web4Rail";
 	public static final String  ID = "id";
diff --git a/src/main/java/de/srsoftware/web4rail/Plan.java b/src/main/java/de/srsoftware/web4rail/Plan.java
index 5681802..d22c9a2 100644
--- a/src/main/java/de/srsoftware/web4rail/Plan.java
+++ b/src/main/java/de/srsoftware/web4rail/Plan.java
@@ -131,6 +131,7 @@ public class Plan extends BaseClass{
 	private static final HashMap<OutputStreamWriter,Integer> clients = new HashMap<OutputStreamWriter, Integer>();
 	private static final String FULLSCREEN = "fullscreen";
 	private static final String SPEED_UNIT = "speed_unit";
+	private static final String LENGTH_UNIT = "length_unit";
 	
 	public HashMap<String,Tile> tiles = new HashMap<String,Tile>(); // The list of tiles of this plan, i.e. the Track layout
 	private HashSet<Block> blocks = new HashSet<Block>(); // the list of tiles, that are blocks
@@ -419,9 +420,9 @@ public class Plan extends BaseClass{
 
 		String content = new String(Files.readAllBytes(new File(filename+".plan").toPath()),UTF8);
 		JSONObject json = new JSONObject(content);
-		JSONArray jTiles = json.getJSONArray(TILE);
-		jTiles.forEach(object -> Tile.load(object, plan));
-		speedUnit = json.getString(SPEED_UNIT);
+		if (json.has(TILE)) json.getJSONArray(TILE).forEach(object -> Tile.load(object, plan));
+		if (json.has(LENGTH_UNIT)) lengthUnit = json.getString(LENGTH_UNIT);
+		if (json.has(SPEED_UNIT)) speedUnit = json.getString(SPEED_UNIT);
 			
 		try {
 			Train.loadAll(filename+".trains",plan);
@@ -603,6 +604,7 @@ public class Plan extends BaseClass{
 		Form form = new Form("plan-properties-form");
 		new Input(REALM,REALM_PLAN).hideIn(form);
 		new Input(ACTION,ACTION_UPDATE).hideIn(form);
+		new Input(LENGTH_UNIT, lengthUnit).addTo(new Label(t("Length unit")+":"+NBSP)).addTo(form);
 		new Input(SPEED_UNIT, speedUnit).addTo(new Label(t("Speed unit")+":"+NBSP)).addTo(form);
 		new Button(t("Save"), form).addTo(form);
 		form.addTo(win);
@@ -708,7 +710,8 @@ public class Plan extends BaseClass{
 		
 		return new JSONObject()
 				.put(TILE, jTiles)
-				.put(SPEED_UNIT, speedUnit);
+				.put(SPEED_UNIT, speedUnit)
+				.put(LENGTH_UNIT, lengthUnit);
 	}
 
 	/**
@@ -894,6 +897,7 @@ public class Plan extends BaseClass{
 		Tile tile = get(params.get(ID),true);
 		if (isSet(tile)) return tile.update(params);
 		
+		if (params.containsKey(LENGTH_UNIT)) lengthUnit = params.get(LENGTH_UNIT);
 		if (params.containsKey(SPEED_UNIT)) speedUnit = params.get(SPEED_UNIT);
 		
 		return t("Plan updated.");
diff --git a/src/main/java/de/srsoftware/web4rail/moving/Car.java b/src/main/java/de/srsoftware/web4rail/moving/Car.java
index 5771a84..4283a5e 100644
--- a/src/main/java/de/srsoftware/web4rail/moving/Car.java
+++ b/src/main/java/de/srsoftware/web4rail/moving/Car.java
@@ -180,7 +180,7 @@ public class Car extends BaseClass implements Comparable<Car>{
 					car.stockId,
 					car.link(),
 					car.maxSpeed == 0 ? "–":(car.maxSpeed+NBSP+speedUnit),
-					car.length,
+					car.length+NBSP+lengthUnit,
 					String.join(", ", car.tags()),
 					car.cloneButton()
 			));
@@ -221,7 +221,7 @@ public class Car extends BaseClass implements Comparable<Car>{
 		Fieldset fieldset = new Fieldset("Basic properties");
 		new Input(NAME,name).addTo(new Label(t("Name")+NBSP)).addTo(fieldset);
 		new Input(STOCK_ID,stockId).addTo(new Label(t("Stock ID")+NBSP)).addTo(fieldset);
-		new Input(LENGTH,length).attr("type", "number").addTo(new Label(t("Length")+NBSP)).addTo(fieldset);
+		new Input(LENGTH,length).attr("type", "number").addTo(new Label(t("Length")+NBSP)).content(NBSP+lengthUnit).addTo(fieldset);
 		new Input(TAGS,String.join(", ", tags)).addTo(new Label(t("Tags")+NBSP)).addTo(fieldset);
 		new Input(MAX_SPEED, maxSpeed).numeric().addTo(new Label(t("Maximum speed")+":"+NBSP)).content(NBSP+speedUnit).addTo(fieldset);
 		fieldset.addTo(form);
diff --git a/src/main/java/de/srsoftware/web4rail/moving/Locomotive.java b/src/main/java/de/srsoftware/web4rail/moving/Locomotive.java
index 60ad891..060d05e 100644
--- a/src/main/java/de/srsoftware/web4rail/moving/Locomotive.java
+++ b/src/main/java/de/srsoftware/web4rail/moving/Locomotive.java
@@ -239,7 +239,7 @@ public class Locomotive extends Car implements Constants,Device{
 			.map(car -> (Locomotive)car)
 			.sorted(Comparator.comparing(loco -> loco.address))
 			.sorted(Comparator.comparing(loco -> loco.stockId))
-			.forEach(loco -> table.addRow(loco.stockId,loco.link(),loco.maxSpeed == 0 ? "–":loco.maxSpeed+NBSP+speedUnit,loco.proto,loco.address,loco.length,String.join(", ", loco.tags())));
+			.forEach(loco -> table.addRow(loco.stockId,loco.link(),loco.maxSpeed == 0 ? "–":loco.maxSpeed+NBSP+speedUnit,loco.proto,loco.address,loco.length+NBSP+lengthUnit,String.join(", ", loco.tags())));
 		table.addTo(win);
 
 		
diff --git a/src/main/java/de/srsoftware/web4rail/moving/Train.java b/src/main/java/de/srsoftware/web4rail/moving/Train.java
index 5286272..28c22ff 100644
--- a/src/main/java/de/srsoftware/web4rail/moving/Train.java
+++ b/src/main/java/de/srsoftware/web4rail/moving/Train.java
@@ -458,7 +458,7 @@ public class Train extends BaseClass implements Comparable<Train> {
 			int ms = train.maxSpeed();
 			table.addRow(		
 				train.link(),
-				train.length(),
+				train.length()+NBSP+lengthUnit,
 				ms == Integer.MAX_VALUE ? "–" : ms+NBSP+speedUnit,
 				String.join(", ", train.tags()),
 				train.route,
diff --git a/src/main/java/de/srsoftware/web4rail/tiles/Tile.java b/src/main/java/de/srsoftware/web4rail/tiles/Tile.java
index 99b0c29..b953ad7 100644
--- a/src/main/java/de/srsoftware/web4rail/tiles/Tile.java
+++ b/src/main/java/de/srsoftware/web4rail/tiles/Tile.java
@@ -241,7 +241,7 @@ public abstract class Tile extends BaseClass{
 		Form form = propForm("tile-properties-"+id());
 		if (isTrack) {
 			new Tag("h4").content(t("Length")).addTo(form);		
-			new Input(LENGTH,length).numeric().addTo(new Label(t("Length")+":"+NBSP)).addTo(form);
+			new Input(LENGTH,length).numeric().addTo(new Label(t("Length")+":"+NBSP)).content(NBSP+lengthUnit).addTo(form);
 			new Tag("h4").content(t("Availability")).addTo(form);
 			Checkbox cb = new Checkbox(DISABLED, t("disabled"), disabled);
 			if (disabled) cb.clazz("disabled");