diff --git a/nml/global_constants.py b/nml/global_constants.py
index 964455b..9107665 100644
--- a/nml/global_constants.py
+++ b/nml/global_constants.py
@@ -1216,6 +1216,8 @@ const_list = [
(named_parameters, param_from_name),
cargo_numbers,
railtype_table,
+ roadtype_table,
+ tramtype_table,
(item_names, item_to_id),
(settings, setting_from_info),
(config_flags, config_flag),