add london underground recipes

advtrains/survival_recipes.lua

@@ -191,6 +191,21 @@ minetest.register_craft({
         {"advtrains:wheel","default:mese","advtrains:wheel"}}
     })
 
+minetest.register_craft({
+    output = "advtrains:under_s7dm",
+    recipe = {
+        {"default:steel_ingot","default:steel_ingot","default:steel_ingot"},
+        {"default:steel_ingot","dye:red","default:steel_ingot"},
+        {"advtrains:wheel","dye:blue","advtrains:wheel"}}
+    })
+minetest.register_craft({
+    output = "advtrains:under_s7ndm",
+    recipe = {
+        {"default:steel_ingot","default:steel_ingot","default:steel_ingot"},
+        {"default:steel_ingot","dye:red","default:glass"},
+        {"advtrains:wheel","default:mese","advtrains:wheel"}}
+    })
+
 
 -- signal stuff