diff --git a/mapsme_json_to_cities.py b/mapsme_json_to_cities.py
new file mode 100644
index 0000000..cac7946
--- /dev/null
+++ b/mapsme_json_to_cities.py
@@ -0,0 +1,36 @@
+"""
+This script generates a list of good/all network names.
+It is used by subway render to generate the list of network at frontend.
+It uses two sources: a mapsme.json validator output with good networks, and
+a google spreadsheet with networks for the process_subways.download_cities()
+function.
+"""
+
+import json
+import sys
+
+from process_subways import download_cities
+
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print('Usage: {} <mapsme.json> [--with-bad]'.format(sys.argv[0]))
+        sys.exit(1)
+
+    with_bad = len(sys.argv) > 2 and sys.argv[2] == '--with-bad'
+
+    subway_json_file = sys.argv[1]
+    with open(subway_json_file) as f:
+        subway_json = json.load(f)
+    good_cities = set(n.get('network', n.get('title')) for n in subway_json['networks'])
+
+    cities = download_cities()
+    lines = []
+    for c in cities:
+        if c.name in good_cities:
+            lines.append(f"{c.name}, {c.country}")
+        elif with_bad:
+            lines.append(f"{c.name}, {c.country} (Bad)")
+
+    for line in sorted(lines):
+        print(line)