diff --git a/README.md b/README.md
index 5cb79bd..05d3075 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Textures: CC BY-SA 3.0
 
 ### Dependencies  
 Required: default, tubelib2, basic_materials, bucket, stairs  
-Optional: unified_inventory, wielded_light  
+Optional: unified_inventory, wielded_light, minecart  
 Highly recommended: signs_bot, minecart  
 
 ### History  
diff --git a/coal_power_station/boiler_top.lua b/coal_power_station/boiler_top.lua
index 267df7a..54b6a53 100644
--- a/coal_power_station/boiler_top.lua
+++ b/coal_power_station/boiler_top.lua
@@ -233,6 +233,7 @@ minetest.register_node("techage:coalboiler_top", {
 	on_timer = node_timer,
 	allow_metadata_inventory_put = allow_metadata_inventory_put,
 	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	allow_metadata_inventory_move = function(pos) return 0 end,
 	on_receive_fields = on_receive_fields,
 	on_rightclick = on_rightclick,
 	
diff --git a/mod.conf b/mod.conf
index 05d54f8..53ee3a8 100644
--- a/mod.conf
+++ b/mod.conf
@@ -1,4 +1,4 @@
 name = techage
 depends = default,tubelib2,basic_materials,bucket,stairs
-optional_depends = unified_inventory,wielded_light
+optional_depends = unified_inventory,wielded_light,minecart
 description = Techage, go through 4 tech ages in search of wealth and power!
\ No newline at end of file
diff --git a/power/power.lua b/power/power.lua
index 1aa8bc4..9f7f812 100644
--- a/power/power.lua
+++ b/power/power.lua
@@ -315,13 +315,17 @@ end
 function techage.power.provide_power(pos, provide)
 	local mem = tubelib2.get_mem(pos)
 	if mem.is_master then
-		accounting(mem)
-		trigger_lamps(pos, mem)
+		--nothing todo
 	elseif mem.master_pos then
 		mem = tubelib2.get_mem(mem.master_pos)
 	else
 		return 0
 	end
+	if (mem.next_cycle or 0) < minetest.get_us_time() then
+		accounting(mem)
+		trigger_lamps(pos, mem)
+		mem.next_cycle = minetest.get_us_time() + 2000000  -- 2s
+	end
 	-- for next cycle
 	mem.available1 = (mem.available1 or 0) + provide
 	-- current cycle
diff --git a/power/power_line.lua b/power/power_line.lua
index 840afab..221fc00 100644
--- a/power/power_line.lua
+++ b/power/power_line.lua
@@ -209,8 +209,17 @@ minetest.register_craft({
 minetest.register_craft({
 	output = "techage:power_pole",
 	recipe = {
-		{"default:stick", "techage:power_line", "default:stick"},
-		{"techage:power_line", "default:copper_ingot", "techage:power_line"},
-		{"default:stick", "techage:power_line", "default:stick"},
+		{"default:stick", "techage:power_lineS", "default:stick"},
+		{"techage:power_lineS", "default:copper_ingot", "techage:power_lineS"},
+		{"default:stick", "techage:power_lineS", "default:stick"},
 	},
 })
+
+if minetest.global_exists("minecart") and minecart.register_protected_node then
+	minecart.register_protected_node("techage:power_line")
+	minecart.register_protected_node("techage:power_lineS")
+	minecart.register_protected_node("techage:power_lineA")
+	minecart.register_protected_node("techage:power_pole")
+	minecart.register_protected_node("default:fence_wood")
+	
+end
\ No newline at end of file
diff --git a/steam_engine/boiler.lua b/steam_engine/boiler.lua
index 55038b1..170aeb6 100644
--- a/steam_engine/boiler.lua
+++ b/steam_engine/boiler.lua
@@ -241,6 +241,7 @@ minetest.register_node("techage:boiler2", {
 	on_timer = node_timer,
 	allow_metadata_inventory_put = allow_metadata_inventory_put,
 	allow_metadata_inventory_take = allow_metadata_inventory_take,
+	allow_metadata_inventory_move = function(pos) return 0 end,
 	on_receive_fields = on_receive_fields,
 	on_rightclick = on_rightclick,