diff --git a/layers/transportation/layer.sql b/layers/transportation/layer.sql
index 65e24df..2765a1e 100644
--- a/layers/transportation/layer.sql
+++ b/layers/transportation/layer.sql
@@ -96,6 +96,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
         )
         UNION ALL
 
+        -- etldoc: osm_railway_linestring       ->  layer_transportation:z12"
         -- etldoc: osm_railway_linestring       ->  layer_transportation:z13
         -- etldoc: osm_railway_linestring       ->  layer_transportation:z14_
         SELECT
@@ -103,7 +104,7 @@ RETURNS TABLE(osm_id bigint, geometry geometry, class text, ramp int, oneway int
             service_value(service) AS service,
             is_bridge, is_tunnel, is_ford, is_ramp, is_oneway, z_order
         FROM osm_railway_linestring
-        WHERE zoom_level = 13 AND (railway='rail' AND service = '')
+        WHERE zoom_level BETWEEN 12 AND 13 AND (railway='rail' AND service = '')
            OR zoom_Level >= 14
         UNION ALL