diff --git a/mods/MAPGEN/tsm_railcorridors/gameconfig.lua b/mods/MAPGEN/tsm_railcorridors/gameconfig.lua
index 7f0538135..aa743c10a 100644
--- a/mods/MAPGEN/tsm_railcorridors/gameconfig.lua
+++ b/mods/MAPGEN/tsm_railcorridors/gameconfig.lua
@@ -12,15 +12,30 @@ tsm_railcorridors.nodes = {
 	torch_wall = "mcl_torches:torch_wall",
 	cobweb = "mcl_core:cobweb",
 	spawner = "mcl_mobspawners:spawner",
+}
 
+local mg_name = minetest.get_mapgen_setting("mg_name")
+
+if mg_name == "v6" then
+	-- In v6, wood is chosen randomly.
 	--[[ Wood types for the corridors. Corridors are made out of full wood blocks
 	and posts. For each corridor system, a random wood type is chosen with the chance
 	specified in per mille. ]]
-	corridor_woods = {
+	tsm_railcorridors.nodes.corridor_woods = {
 		{ wood = "mcl_core:wood", post = "mcl_fences:fence", chance = 900},
 		{ wood = "mcl_core:darkwood", post = "mcl_fences:dark_oak_fence", chance = 100},
-	},
-}
+	}
+else
+	-- This generates dark oak wood in mesa biomes and oak wood everywhere else.
+	tsm_railcorridors.nodes.corridor_woods_function = function(pos, node)
+		if minetest.get_item_group(node.name, "hardened_clay") ~= 0 then
+			return "mcl_core:darkwood", "mcl_fences:dark_oak_fence"
+		else
+			return "mcl_core:wood", "mcl_fences:fence"
+		end
+	end
+end
+	
 
 -- TODO: Use minecart with chest instead of normal minecart
 tsm_railcorridors.carts = { "mcl_minecarts:minecart" }
@@ -41,8 +56,6 @@ function tsm_railcorridors.on_construct_spawner(pos)
 	mcl_mobspawners.setup_spawner(pos, "mobs_mc:cave_spider")
 end
 
-local mg_name = minetest.get_mapgen_setting("mg_name")
-
 -- MineClone 2's treasure function. Gets all treasures for a single chest.
 -- Based on information from Minecraft Wiki.
 function tsm_railcorridors.get_treasures(pr)
diff --git a/mods/MAPGEN/tsm_railcorridors/init.lua b/mods/MAPGEN/tsm_railcorridors/init.lua
index 78d21f983..b95144b25 100644
--- a/mods/MAPGEN/tsm_railcorridors/init.lua
+++ b/mods/MAPGEN/tsm_railcorridors/init.lua
@@ -746,6 +746,7 @@ local function place_corridors(main_cave_coords, psra)
 	if not IsGround(main_cave_coords) then
 		return
 	end
+	local center_node = minetest.get_node(main_cave_coords)
 
 	-- Determine if this corridor system is “damaged” (some rails removed) and to which extent
 	local damage = 0
@@ -769,25 +770,33 @@ local function place_corridors(main_cave_coords, psra)
 	local xs = pr:next(0, 2) < 1
 	local zs = pr:next(0, 2) < 1;
 
-	-- Select random wood type (found in gameconfig.lua)
-	local rnd = pr:next(1,1000)
+	-- Get wood and fence post types, using gameconfig.
+	local wood, post
+	if tsm_railcorridors.nodes.corridor_woods_function then
+		-- Get wood type by gameconfig function
+		wood, post = tsm_railcorridors.nodes.corridor_woods_function(main_cave_coords, center_node)
+	else
+		-- Select random wood type (found in gameconfig.lua)
+		local rnd = pr:next(1,1000)
+		local woodtype = 1
+		local accumulated_chance = 0
 
-	local woodtype = 1
-	local accumulated_chance = 0
-	for w=1, #tsm_railcorridors.nodes.corridor_woods do
-		local woodtable = tsm_railcorridors.nodes.corridor_woods[w]
-		accumulated_chance = accumulated_chance + woodtable.chance
-		if accumulated_chance > 1000 then
-			minetest.log("warning", "[tsm_railcorridors] Warning: Wood chances add up to over 100%!")
-			break
-		end
-		if rnd <= accumulated_chance then
-			woodtype = w
-			break
+		for w=1, #tsm_railcorridors.nodes.corridor_woods do
+			local woodtable = tsm_railcorridors.nodes.corridor_woods[w]
+			accumulated_chance = accumulated_chance + woodtable.chance
+			if accumulated_chance > 1000 then
+				minetest.log("warning", "[tsm_railcorridors] Warning: Wood chances add up to over 100%!")
+				break
+			end
+			if rnd <= accumulated_chance then
+				woodtype = w
+				break
+			end
 		end
+		wood = tsm_railcorridors.nodes.corridor_woods[woodtype].wood
+		post = tsm_railcorridors.nodes.corridor_woods[woodtype].post
 	end
-	local wood = tsm_railcorridors.nodes.corridor_woods[woodtype].wood
-	local post = tsm_railcorridors.nodes.corridor_woods[woodtype].post
+
 	start_corridor(main_cave_coords, "x", xs, pr:next(way_min,way_max), psra, wood, post, damage, false)
 	start_corridor(main_cave_coords, "z", zs, pr:next(way_min,way_max), psra, wood, post, damage, false)
 	-- Auch mal die andere Richtung?