diff --git a/src/Mod/FreeCADExchange/RoutingNetwork.py b/src/Mod/FreeCADExchange/RoutingNetwork.py
index 022df06..aabcf90 100644
--- a/src/Mod/FreeCADExchange/RoutingNetwork.py
+++ b/src/Mod/FreeCADExchange/RoutingNetwork.py
@@ -409,6 +409,20 @@ def _ensure_vector_list_property(obj, prop_name, description):
         )
 
 
+def _ensure_integer_property(obj, prop_name, description, value):
+    if prop_name not in getattr(obj, "PropertiesList", []):
+        obj.addProperty(
+            "App::PropertyInteger",
+            prop_name,
+            PROPERTY_GROUP,
+            description,
+        )
+    try:
+        setattr(obj, prop_name, int(value))
+    except Exception:
+        setattr(obj, prop_name, 0)
+
+
 def _set_route_carrier_semantics(obj, project_uuid="", kind=ROUTE_CARRIER_KIND):
     TerminalObjects.ensure_string_property(
         obj,
@@ -438,6 +452,12 @@ def _set_route_carrier_semantics(obj, project_uuid="", kind=ROUTE_CARRIER_KIND):
         "Whether routing connections can use this path",
         True,
     )
+    _ensure_integer_property(
+        obj,
+        "QetRouteCarrierCapacity",
+        "How many routed wires can reuse this carrier segment before detouring is preferred",
+        1,
+    )
     return obj
 
 
diff --git a/tests/python/freecad_exchange_auto_routing_test.py b/tests/python/freecad_exchange_auto_routing_test.py
index 953ce76..7abd8f9 100644
--- a/tests/python/freecad_exchange_auto_routing_test.py
+++ b/tests/python/freecad_exchange_auto_routing_test.py
@@ -613,6 +613,23 @@ class AutoRoutingTest(unittest.TestCase):
         self.assertEqual((0.65, 0.2, 1.0), terminal_access.ViewObject.LineColor)
         self.assertEqual("Solid", terminal_access.ViewObject.DrawStyle)
 
+    def test_route_carrier_exposes_capacity_property_for_auto_routing(self):
+        _install_fake_freecad()
+        terminal_objects, _wiring_objects, routing_network, _auto_routing = _reload_modules()
+        app = sys.modules["FreeCAD"]
+        doc = FakeDocument()
+        terminal_objects.ensure_root_group(doc, "project-1")
+
+        carrier = routing_network.create_route_carrier(
+            doc,
+            [app.Vector(0, 0, 20), app.Vector(100, 0, 20)],
+            project_uuid="project-1",
+            kind="WireDuct",
+        )
+
+        self.assertIn("QetRouteCarrierCapacity", carrier.PropertiesList)
+        self.assertEqual(1, carrier.QetRouteCarrierCapacity)
+
     def test_route_graph_connects_crossing_carriers_at_intersection(self):
         _install_fake_freecad()
         terminal_objects, _wiring_objects, routing_network, auto_routing = _reload_modules()