diff --git a/cybersyn/control.lua b/cybersyn/control.lua
index 3b05289..bfa8fbf 100644
--- a/cybersyn/control.lua
+++ b/cybersyn/control.lua
@@ -10,3 +10,4 @@ require("scripts.gui")
 require("scripts.migrations")
 require("scripts.main")
 require("scripts.remote-interface")
+require("scripts.gui-events")
diff --git a/cybersyn/locale/en/base.cfg b/cybersyn/locale/en/base.cfg
index dbba4ea..e4c1191 100644
--- a/cybersyn/locale/en/base.cfg
+++ b/cybersyn/locale/en/base.cfg
@@ -88,6 +88,10 @@ network=Network
 network-tooltip=A signal is used to identify which network this combinator is a member of. Trains will only be dispatched from depots to provider and requester stations if they are all identified with the same signal.
 allow-list-description=Automatic allow-list
 allow-list-tooltip=Normally when a delivery is requested, any train with a large enough cargo capacity may fulfill it. When this setting is checked trains must also be on this station's "allow-list". Trains are automatically added to the allow-list if each of its wagons are able to be loaded or unloaded by inserters or pumps along this station.
+allow-list-refresh-description=Refresh allow-list
+allow-list-refresh-tooltip=The allow-list is defined upon placement of the combinator based on the entities around it. As this is an expensive operation, it is seldom performed outside of this event. This button will cause this combinator to immediately recalculate its allow-list.
+allow-list-preview=Allow List
+allow-list-preview-tooltip=This is the list describing what trains are allowed to dock at this station.\n0 = Locomotive\n1 = Item\n2 = Fluid\n3 = Both
 is-stack-description=Stack thresholds
 is-stack-tooltip=When checked all request thresholds for this station are interpreted as a count of item stacks rather than a count of total items. Thresholds for fluids are unaffected.
 enable-inactive-description=Inactivity condition
diff --git a/cybersyn/scripts/gui-events.lua b/cybersyn/scripts/gui-events.lua
new file mode 100644
index 0000000..5e51ce4
--- /dev/null
+++ b/cybersyn/scripts/gui-events.lua
@@ -0,0 +1,10 @@
+script.on_event(defines.events.on_gui_click, function(event)
+    if event.element.name ~= "allow_list_refresh" then return end
+    --game.print(serpent.block(event.element.tags))
+
+    -- < function interface.reset_stop_layout(stop_id, forbidden_entity, force_update)
+    local combId = event.element.tags.id
+    local stopId = storage.to_stop[combId].unit_number
+    remote.call("cybersyn", "reset_stop_layout", stopId, nil, true)
+    update_allow_list_section(event.player_index, combId)
+end)
\ No newline at end of file
diff --git a/cybersyn/scripts/gui.lua b/cybersyn/scripts/gui.lua
index b916b94..41bbb7c 100644
--- a/cybersyn/scripts/gui.lua
+++ b/cybersyn/scripts/gui.lua
@@ -100,6 +100,8 @@ local function handle_drop_down(e)
 	end
 
 	combinator_update(storage, comb)
+
+	update_allow_list_section(e.player_index, comb.unit_number)
 end
 ---@param e EventData.on_gui_switch_state_changed
 local function handle_pr_switch(e)
@@ -150,6 +152,48 @@ local function handle_setting_flip(e)
 	set_comb_setting(comb, element.tags.bit--[[@as int]], not element.state)
 
 	combinator_update(storage, comb)
+
+	update_allow_list_section(e.player_index, comb.unit_number)
+end
+
+local function generate_stop_layout(combId)
+	local targetStop = storage.to_stop[combId]
+	local stopLayout = ""
+	if targetStop ~= nil then
+		local station = storage.stations[targetStop.unit_number]
+		local refueler = storage.refuelers[targetStop.unit_number]
+		if station ~= nil then
+			stopLayout = station.layout_pattern
+		elseif refueler ~= nil then
+			stopLayout = refueler.layout_pattern
+		end
+	end
+
+	--TODO: improve readability
+	return serpent.line(stopLayout)
+end
+
+function get_allow_list_section(player_index)
+	local player = game.get_player(player_index)
+	if player.opened.name == "cybersyn-combinator" then
+		--this WILL crash if the order of elements in the UI is modified
+		--TODO: make this dynamic based on property names? or store a ref to the layout preview section?
+		return player.opened.children[2].children[1].children[8]
+	end
+end
+
+function update_allow_list_section(player_index, comb_unit_number)
+	local layoutSection = get_allow_list_section(player_index)
+	if layoutSection ~= nil then
+		local selected_index, signal, switch_state, bits = get_comb_gui_settings(storage.to_comb[comb_unit_number])
+		--only for Station (1) and Refueler (3)
+		if ((selected_index == 1 or selected_index == 3) and setting_flip(bits, SETTING_DISABLE_ALLOW_LIST)) then
+			layoutSection.visible = true
+			layoutSection.children[2].caption = generate_stop_layout(comb_unit_number)
+		else
+			layoutSection.visible = false
+		end
+	end
 end
 
 local function on_gui_opened(event)
@@ -196,6 +240,14 @@ function gui_opened(comb, player)
 	local rootgui = player.gui.screen
 	local selected_index, signal, switch_state, bits = get_comb_gui_settings(comb)
 
+	local showLayout = false
+	local layoutText = ""
+	--only for Station (1) and Refueler (3)
+	if ((selected_index == 1 or selected_index == 3) and setting_flip(bits, SETTING_DISABLE_ALLOW_LIST)) then
+		showLayout = true
+		layoutText = generate_stop_layout(comb.unit_number)
+	end
+
 	local _, main_window = flib_gui.add(rootgui, {
 		{type="frame", direction="vertical", name=COMBINATOR_NAME, children={
 			--title bar
@@ -242,6 +294,12 @@ function gui_opened(comb, player)
 							{type="checkbox", name="is_stack", state=setting(bits, SETTING_IS_STACK), handler=handle_setting, tags={id=comb.unit_number, bit=SETTING_IS_STACK}, tooltip={"cybersyn-gui.is-stack-tooltip"}, caption={"cybersyn-gui.is-stack-description"}},
 						}},
 						{type="checkbox", name="enable_inactive", state=setting(bits, SETTING_ENABLE_INACTIVE), handler=handle_setting, tags={id=comb.unit_number, bit=SETTING_ENABLE_INACTIVE}, tooltip={"cybersyn-gui.enable-inactive-tooltip"}, caption={"cybersyn-gui.enable-inactive-description"}},
+					}},
+					--preview allow list
+					{type="flow", name="bottom-allowlist", direction="vertical", style_mods={vertical_align="top"}, visible=showLayout, children={
+						{type="label", name="allow_list_label_title", style="heading_2_label", caption={"cybersyn-gui.allow-list-preview"}, tooltip={"cybersyn-gui.allow-list-preview-tooltip"}, style_mods={top_padding=8}},
+						{type="label", name="allow_list_label", caption=layoutText, style_mods={top_padding=8}},
+						{type="button", name="allow_list_refresh", tags={id=comb.unit_number}, tooltip={"cybersyn-gui.allow-list-refresh-tooltip"}, caption={"cybersyn-gui.allow-list-refresh-description"}},
 					}}
 				}}
 			}}
@@ -255,3 +313,4 @@ function gui_opened(comb, player)
 	set_visibility(main_window, selected_index)
 	player.opened = main_window
 end
+