diff --git a/scripts/devel/cmptiles.lua b/scripts/devel/cmptiles.lua
new file mode 100644
index 000000000..8421038eb
--- /dev/null
+++ b/scripts/devel/cmptiles.lua
@@ -0,0 +1,42 @@
+-- Lists and/or compares two tiletype material groups.
+-- Usage: devel/cmptiles material1 [material2]
+
+local nmat1,nmat2=...
+local mat1 = df.tiletype_material[nmat1]
+local mat2 = df.tiletype_material[nmat2]
+
+local tmat1 = {}
+local tmat2 = {}
+
+local attrs = df.tiletype.attrs
+
+for i=df.tiletype._first_item,df.tiletype._last_item do
+    local shape = df.tiletype_shape[attrs[i].shape] or ''
+    local variant = df.tiletype_variant[attrs[i].variant] or ''
+    local special = df.tiletype_special[attrs[i].special] or ''
+    local direction = attrs[i].direction or ''
+    local code = shape..':'..variant..':'..special..':'..direction
+
+    if attrs[i].material == mat1 then
+        tmat1[code] = true
+    end
+    if attrs[i].material == mat2 then
+        tmat2[code] = true
+    end
+end
+
+local function list_diff(n, t1, t2)
+    local lst = {}
+    for k,v in pairs(t1) do
+        if not t2[k] then
+            lst[#lst+1] = k
+        end
+    end
+    table.sort(lst)
+    for k,v in ipairs(lst) do
+        print(n, v)
+    end
+end
+
+list_diff(nmat1,tmat1,tmat2)
+list_diff(nmat2,tmat2,tmat1)
diff --git a/scripts/devel/watch-minecarts.lua b/scripts/devel/watch-minecarts.lua
new file mode 100644
index 000000000..166004d85
--- /dev/null
+++ b/scripts/devel/watch-minecarts.lua
@@ -0,0 +1,74 @@
+-- Logs minecart coordinates and speeds to console.
+
+last_stats = last_stats or {}
+
+function compare_one(vehicle)
+    local last = last_stats[vehicle.id]
+    local item = df.item.find(vehicle.item_id)
+    local ipos = item.pos
+    local new = {
+        ipos.x*100000 + vehicle.offset_x, vehicle.speed_x,
+        ipos.y*100000 + vehicle.offset_y, vehicle.speed_y,
+        ipos.z*100000 + vehicle.offset_z, vehicle.speed_z
+    }
+
+    if (last == nil) or item.flags.on_ground then
+        local delta = { vehicle.id }
+        local show = (last == nil)
+
+        for i=1,6 do
+            local rv = 0
+            if last then
+                rv = last[i]
+            end
+            delta[i*2] = new[i]/100000
+            local dv = new[i] - rv
+            delta[i*2+1] = dv/100000
+            if dv ~= 0 then
+                show = true
+            end
+        end
+
+        if show then
+            print(table.unpack(delta))
+        end
+    end
+
+    last_stats[vehicle.id] = new
+end
+
+function compare_all()
+    local seen = {}
+    for _,v in ipairs(df.global.world.vehicles.all) do
+        seen[v.id] = true
+        compare_one(v)
+    end
+    for k,v in pairs(last_stats) do
+        if not seen[k] then
+            print(k,'DEAD')
+        end
+    end
+end
+
+function start_timer()
+    if not dfhack.timeout_active(timeout_id) then
+        timeout_id = dfhack.timeout(1, 'ticks', function()
+            compare_all()
+            start_timer()
+        end);
+        if not timeout_id then
+            dfhack.printerr('Could not start timer in watch-minecarts')
+        end
+    end
+end
+
+compare_all()
+
+local cmd = ...
+
+if cmd == 'start' then
+    start_timer()
+elseif cmd == 'stop' then
+    dfhack.timeout_active(timeout_id, nil)
+end
+