Переделал методы из требования №5

ProjectMonorail/CollectionGenericObjects/AbstractCompany.cs

@@ -67,7 +67,7 @@ public abstract class AbstractCompany
     {
         if(company._collection == null)
         {
-            return 0;
+            return -1;
         }
         return company._collection.Insert(train);
     }

ProjectMonorail/CollectionGenericObjects/ICollectionGenericObjects.cs

@@ -36,7 +36,7 @@ public interface ICollectionGenericObjects<T>
     /// <param name="obj">Добавляемый объект</param>
     /// <param name="position">Позиция</param>
     /// <returns>true - вставка прошла удачно, false - вставка не удалась</returns>
-    bool Insert(T obj, int position);
+    int Insert(T obj, int position);
 
     /// <summary>
     /// Удаление объекта из коллекции с конкретной позиции

ProjectMonorail/CollectionGenericObjects/MassiveGenericObjects.cs

@@ -49,21 +49,21 @@ public class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
                 return i;
             }
         }
-        return 0;
+        return -1;
     }
 
-    public bool Insert(T obj, int position)
+    public int Insert(T obj, int position)
     {
         if (position < 0 || position >= Count)
         {
-            return false;
+            return -1;
         }
         for (int i = position; i < Count; i++)
         {
             if (_collection[i] == null)
             {
                 _collection[i] = obj;
-                return true;
+                return i;
             }
         }
         for (int i = position - 1; i >= 0; i--)
@@ -71,10 +71,10 @@ public class MassiveGenericObjects<T> : ICollectionGenericObjects<T>
             if (_collection[i] == null)
             {
                 _collection[i] = obj;
-                return true;
+                return i;
             }
         }
-        return false;
+        return -1;
     }
 
     public T Remove(int position)

ProjectMonorail/CollectionGenericObjects/TrainSharingService.cs

@@ -41,9 +41,9 @@ public class TrainSharingService : AbstractCompany
     {
         int counter = 0;
         int valPlaceY = _pictureHeight / _placeSizeHeight;
-        for (int y = (valPlaceY - 1) * _placeSizeHeight; y >= 0; y -= _placeSizeHeight)
+        for (int y = ((valPlaceY - 1) * _placeSizeHeight) + 30; y >= 0; y -= _placeSizeHeight)
         {
-            for (int x = 5; x + _placeSizeWidth < _pictureWidth; x += _placeSizeWidth)
+            for (int x = 10; x + _placeSizeWidth < _pictureWidth; x += _placeSizeWidth)
             {
                 _collection?.Get(counter)?.SetPictureSize(_pictureWidth, _pictureHeight);
                 _collection?.Get(counter)?.SetPosition(x, y);

ProjectMonorail/FormTrainCollection.cs

@@ -86,7 +86,7 @@ public partial class FormTrainCollection : Form
             default: return;
         }
 
-        if (_company + drawingTrain != 0)
+        if (_company + drawingTrain != -1)
         {
             MessageBox.Show("Объект добавлен");
             pictureBox.Image = _company.Show();