diff --git a/compiler/router/router.py b/compiler/router/router.py
index d317d6b9..41a5ad9a 100644
--- a/compiler/router/router.py
+++ b/compiler/router/router.py
@@ -66,7 +66,8 @@ class router(router_tech):
         self.boundary = self.layout.measureBoundary(self.top_name)
         # These must be un-indexed to get rid of the matrix type
         self.ll = vector(self.boundary[0][0], self.boundary[0][1])
-        self.ur = vector(self.boundary[1][0], self.boundary[1][1])
+        # Pad the UR by a few tracks to add an extra rail possibly
+        self.ur = vector(self.boundary[1][0], self.boundary[1][1]) + self.track_widths.scale(5,5)
 
     def clear_pins(self):
         """
diff --git a/compiler/router/router_tech.py b/compiler/router/router_tech.py
index 56e8e418..94c4268a 100644
--- a/compiler/router/router_tech.py
+++ b/compiler/router/router_tech.py
@@ -1,6 +1,7 @@
 from tech import drc,layer
 from contact import contact
 from pin_group import pin_group
+from vector import vector
 import debug
 
 class router_tech:
@@ -35,8 +36,8 @@ class router_tech:
         self.track_width = max(self.horiz_track_width,self.vert_track_width)
         debug.info(1,"Track width: "+str(self.track_width))
 
-        self.track_widths = [self.track_width] * 2
-        self.track_factor = [1/self.track_width] * 2
+        self.track_widths = vector([self.track_width] * 2)
+        self.track_factor = vector([1/self.track_width] * 2)
         debug.info(2,"Track factor: {0}".format(self.track_factor))
 
         # When we actually create the routes, make them the width of the track (minus 1/2 spacing on each side)