diff --git a/lib/engine/game/g_1867/step/single_item_auction.rb b/lib/engine/game/g_1867/step/single_item_auction.rb
index 0e1b21c432..61688feba0 100644
--- a/lib/engine/game/g_1867/step/single_item_auction.rb
+++ b/lib/engine/game/g_1867/step/single_item_auction.rb
@@ -15,6 +15,7 @@ class SingleItemAuction < Engine::Step::Base
 
           def actions(entity)
             return [] if @companies.empty?
+            return %w[bid pass] if @auctioning
 
             entity == current_entity ? ACTIONS : []
           end
diff --git a/lib/engine/game/g_18_bf/game.rb b/lib/engine/game/g_18_bf/game.rb
index 67228b4e4f..63ea98fe2c 100644
--- a/lib/engine/game/g_18_bf/game.rb
+++ b/lib/engine/game/g_18_bf/game.rb
@@ -84,7 +84,7 @@ def operating_round(round_num)
             Engine::Step::BuyCompany,
             G1867::Step::RedeemShares,
             G18BF::Step::SpecialTrack,
-            G1867::Step::Track,
+            G18BF::Step::Track,
             G1867::Step::Token,
             Engine::Step::Route,
             G1867::Step::Dividend,
@@ -105,12 +105,14 @@ def event_minors_batch3!
         end
 
         def event_u1_available!
-          u1 = @future_companies.delete { |company| company.sym == 'U1' }
+          u1 = @future_companies.find { |company| company.sym == 'U1' }
+          @future_companies.delete(u1)
           @companies << u1
         end
 
         def event_u2_available!
-          u2 = @future_companies.delete { |company| company.sym == 'U2' }
+          u2 = @future_companies.find { |company| company.sym == 'U2' }
+          @future_companies.delete(u2)
           @companies << u2
         end
 
@@ -146,6 +148,19 @@ def revenue_for(route, stops)
             end
           super + bonuses
         end
+
+        def check_other(route)
+          check_london(route)
+        end
+
+        def check_london(route)
+          # Can only run to London if running to your own token.
+          london_stops = route.visited_stops & @london_cities
+          return if london_stops.all? { |city| city.tokened_by?(current_entity) }
+
+          raise GameError, 'Route may not include London unless running to a ' \
+                           "#{current_entity.id} token."
+        end
       end
     end
   end
diff --git a/lib/engine/game/g_18_bf/map.rb b/lib/engine/game/g_18_bf/map.rb
index efa0afa1b8..246c5b669e 100644
--- a/lib/engine/game/g_18_bf/map.rb
+++ b/lib/engine/game/g_18_bf/map.rb
@@ -259,19 +259,41 @@ module Map
           { coord1: 'M29', edge1: 5, coord2: 'V24', edge2: 2 },
         ].freeze
         LONDON_HEX_CENTRE = 'L28'
+        LONDON_HEX_ON_MAP = 'U23'
 
         def setup_london_hexes
+          # Keep references to London hexes for tracking upgrades.
+          @london_small = @hexes.find { |hex| hex.coordinates == LONDON_HEX_ON_MAP }
+          @london_zoomed = []
+
           # Join the hexes adjacent to London to the expanded hexes.
           LONDON_HEX_NEIGHBOURS.each do |item|
             hex1 = @hexes.find { |hex| hex.coordinates == item[:coord1] }
             hex2 = @hexes.find { |hex| hex.coordinates == item[:coord2] }
             hex1.neighbors[item[:edge1]] = hex2
             hex2.neighbors[item[:edge2]] = hex1
+            @london_zoomed << hex1
           end
 
           # Sever all connections from the London hex on the main map.
           london = @hexes.find { |hex| hex.coordinates == LONDON_HEX_CENTRE }
           london.neighbors.clear
+          @london_zoomed << london
+
+          # Keep references to the London cities for managing routes.
+          @london_cities = @london_zoomed.flat_map { |hex| hex.tile.cities }
+        end
+
+        # Keeps the zoomed London hex colour and city revenue in sync with the
+        # London tile on the map.
+        def london_upgraded(new_tile)
+          color = new_tile.color
+          revenue = new_tile.offboards.first.revenue[color]
+
+          @london_zoomed.each do |hex|
+            hex.color = color
+            hex.cities.each { |city| city.revenue = revenue }
+          end
         end
 
         # Bonus revenues are shown on the map as detached offboard areas.
diff --git a/lib/engine/game/g_18_bf/step/track.rb b/lib/engine/game/g_18_bf/step/track.rb
new file mode 100644
index 0000000000..53f6d2ddc8
--- /dev/null
+++ b/lib/engine/game/g_18_bf/step/track.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+require_relative '../../g_1867/step/track'
+
+module Engine
+  module Game
+    module G18BF
+      module Step
+        class Track < G1867::Step::Track
+          def available_hex(entity, hex)
+            return super unless hex == @london_small
+
+            london_available?(entity)
+          end
+
+          def london_available?(entity)
+            @london_zoomed.any? { |hex| available_hex(entity, hex) }
+          end
+
+          def lay_tile(action, extra_cost: 0, entity: nil, spender: nil)
+            super
+
+            @game.london_upgraded(action.hex.tile) if action.hex == @london_small
+          end
+        end
+      end
+    end
+  end
+end