diff --git a/FormMapWithSetLocomotives.java b/FormMapWithSetLocomotives.java
index 62436e5..a6d8d69 100644
--- a/FormMapWithSetLocomotives.java
+++ b/FormMapWithSetLocomotives.java
@@ -77,7 +77,7 @@ public class FormMapWithSetLocomotives extends JComponent {
 
             DrawningObjectLocomotive locomotive = new DrawningObjectLocomotive(formLocomotive.getSelectedLocomotive());
             //TODO
-            if (_mapLocomotivesCollectionGeneric.Plus(locomotive)) {
+            if (_mapLocomotivesCollectionGeneric.Plus(locomotive) != -1) {
                 JOptionPane.showMessageDialog(formFrame, "Object added", "Success", JOptionPane.OK_CANCEL_OPTION);
                 bufferImg = _mapLocomotivesCollectionGeneric.ShowSet();
                 repaint();
@@ -112,7 +112,7 @@ public class FormMapWithSetLocomotives extends JComponent {
                 return;
             }
             int position = Integer.parseInt(finalMaskedTextFieldPosition.getText());
-            if (_mapLocomotivesCollectionGeneric.Minus(position)) {
+            if (_mapLocomotivesCollectionGeneric.Minus(position) != null) {
                 JOptionPane.showMessageDialog(formFrame, "Object removed", "Success", JOptionPane.OK_CANCEL_OPTION);
                 bufferImg = _mapLocomotivesCollectionGeneric.ShowSet();
                 repaint();
diff --git a/MapWithSetLocomotivesGeneric.java b/MapWithSetLocomotivesGeneric.java
index 3933913..f92bf87 100644
--- a/MapWithSetLocomotivesGeneric.java
+++ b/MapWithSetLocomotivesGeneric.java
@@ -30,12 +30,12 @@ public class MapWithSetLocomotivesGeneric
 
     /// Добавление
     //TODO
-    public boolean Plus(T locomotive)
+    public int Plus(T locomotive)
     {
         return this._setLocomotives.Insert(locomotive);
     }
     /// Удаление
-    public boolean Minus(int position)
+    public T Minus(int position)
     {
         return this._setLocomotives.Remove(position);
     }
diff --git a/SetLocomotivesGeneric.java b/SetLocomotivesGeneric.java
index 5c32864..7256512 100644
--- a/SetLocomotivesGeneric.java
+++ b/SetLocomotivesGeneric.java
@@ -10,15 +10,15 @@ public class SetLocomotivesGeneric <T>
         _places = (T[]) new Object[count];
     }
 
-    public boolean Insert (T locomotive) {
+    public int Insert (T locomotive) {
         return Insert(locomotive, 0);
     }
 
-    public boolean Insert (T locomotive, int position) {
-        if (position >= _places.length || position < 0) return false;
+    public int Insert (T locomotive, int position) {
+        if (position >= _places.length || position < 0) return -1;
         if (_places[position] == null) {
             _places[position] = locomotive;
-            return true;
+            return position;
         }
 
         int emptyEl = -1;
@@ -32,20 +32,21 @@ public class SetLocomotivesGeneric <T>
         }
         if (emptyEl == -1)
         {
-            return false;
+            return -1;
         }
         for (int i = emptyEl; i > position; i--)
         {
             _places[i] = _places[i - 1];
         }
         _places[position] = locomotive;
-        return true;
+        return position;
     }
 
-    public boolean Remove (int position) {
-        if (position >= _places.length || position < 0) return false;
+    public T Remove (int position) {
+        if (position >= _places.length || position < 0) return null;
+        T result = _places[position];
         _places[position] = null;
-        return true;
+        return result;
     }
 
     public T Get(int position)