diff --git a/ProjectStudying/ProjectStudying/CollectionGenericObjects/ListGenericObjects.cs b/ProjectStudying/ProjectStudying/CollectionGenericObjects/ListGenericObjects.cs
index b775639..de8ab37 100644
--- a/ProjectStudying/ProjectStudying/CollectionGenericObjects/ListGenericObjects.cs
+++ b/ProjectStudying/ProjectStudying/CollectionGenericObjects/ListGenericObjects.cs
@@ -51,17 +51,47 @@ public class ListGenericObjects<T> : ICollectionGenericObjects<T>
         return _collection[position];
     }
 
-    public int Insert(T? obj)
+    public int Insert(T obj, IEqualityComparer<DrawningLocomotive?>? comparer = null)
     {
-        if (Count == _maxCount) throw new CollectionOverflowException(Count);
+        // TODO выброс ошибки, если переполнение
+        // TODO выброс ошибки, если такой объект есть в коллекции
+        if (Count == _maxCount)
+        {
+            throw new CollectionOverflowException(Count);
+        }
+
+        for (int i = 0; i < Count; i++)
+        {
+            if (comparer.Equals((_collection[i] as DrawningLocomotive), (obj as DrawningLocomotive)))
+            {
+                throw new ObjectAlreadyInCollectionException(i);
+            }
+        }
+
         _collection.Add(obj);
-        return Count - 1;
+        return _collection.Count;
     }
 
-    public int Insert(T? obj, int position)
+    public int Insert(T obj, int position, IEqualityComparer<DrawningLocomotive?>? comparer = null)
     {
-        if (Count == _maxCount) throw new CollectionOverflowException(Count);
-        if (position < 0 || position >= Count) throw new PositionOutOfCollectionException(position);
+        if (position < 0 || position > Count)
+        {
+            throw new PositionOutOfCollectionException(position);
+        }
+
+        if (Count == _maxCount)
+        {
+            throw new CollectionOverflowException(Count);
+        }
+
+        for (int i = 0; i < Count; i++)
+        {
+            if (comparer.Equals((_collection[i] as DrawningLocomotive), (obj as DrawningLocomotive)))
+            {
+                throw new ObjectAlreadyInCollectionException(i);
+            }
+        }
+
         _collection.Insert(position, obj);
         return position;
     }
@@ -82,16 +112,6 @@ public class ListGenericObjects<T> : ICollectionGenericObjects<T>
         }
     }
 
-    public int Insert(T obj, IEqualityComparer<DrawningLocomotive?>? comparer = null)
-    {
-        throw new NotImplementedException();
-    }
-
-    public int Insert(T obj, int position, IEqualityComparer<DrawningLocomotive?>? comparer = null)
-    {
-        throw new NotImplementedException();
-    }
-
     public void CollectionSort(IComparer<T?> comparer)
     {
         _collection.Sort(comparer);