diff --git a/Bus.py b/Bus.py
new file mode 100644
index 0000000..6f6ed0a
--- /dev/null
+++ b/Bus.py
@@ -0,0 +1,18 @@
+from Vehicle import Vehicle
+
+class Bus(Vehicle):
+    def __init__(self, brand, model, year, capacity):
+        super().__init__(brand, model, year)
+        self.capacity = capacity
+
+    def display_info(self):
+        """Override the parent class method for a Bus."""
+        return f"Bus: {self._brand} {self._model}, seats {self.capacity} passengers ({self._year})"
+
+    def honk(self):
+        """Specific implementation for a bus."""
+        return "Beep Beep! Make way for the bus!"
+
+    def open_doors(self):
+        """Simulate opening the bus doors."""
+        return "The bus doors are open."
diff --git a/Car.py b/Car.py
index 9741b1f..3e43300 100644
--- a/Car.py
+++ b/Car.py
@@ -12,3 +12,8 @@ def display_info(self):
     def honk(self):
         """Specific implementation for a car."""
         return "Honk honk!"
+
+    def start_engine(self):
+        """Simulate starting the engine of the car."""
+        return f"{self._brand} {self._model}'s engine has started!"
+