diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..b5dfbc9
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+# Top-most EditorConfig file
+root = true
+
+# Set the default charset
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
diff --git a/src/functions.pnml b/src/functions.pnml
index 2bd4d2a..2f0e637 100644
--- a/src/functions.pnml
+++ b/src/functions.pnml
@@ -224,28 +224,28 @@ switch (FEAT_TRAINS, SELF, muhead_mtr, vehicle_type_id) {
 
 switch (FEAT_TRAINS, SELF, mu_of_mtr, vehicle_type_id) {
     1856..2751: return can_attach_in_mtr;
-    return cannot_attach_in_mtr;
+    return CB_RESULT_ATTACH_DISALLOW;
 }
 
 switch (FEAT_TRAINS, SELF, muhead_with_first_class, vehicle_type_id) {
     1856..1857: return can_attach_in_mtr;
-    return cannot_attach_in_mtr;
+    return CB_RESULT_ATTACH_DISALLOW;
 }
 
 switch (FEAT_TRAINS, SELF, muhead_yellowhead_exurb, vehicle_type_id) {
     1856..1858: return can_attach_in_mtr;
-    return cannot_attach_in_mtr;
+    return CB_RESULT_ATTACH_DISALLOW;
 }
 
 switch (FEAT_TRAINS, SELF, muhead_airport_express, vehicle_type_id) {
     1857: return can_attach_in_mtr;
     1859: return can_attach_in_mtr;
-    return cannot_attach_in_mtr;
+    return CB_RESULT_ATTACH_DISALLOW;
 }
 
 switch (FEAT_TRAINS, SELF, muhead_without_first_class, vehicle_type_id) {
     1856: return can_attach_in_mtr;
-    return cannot_attach_in_mtr;
+    return CB_RESULT_ATTACH_DISALLOW;
 }