diff --git a/scripts/merge-yaml.js b/scripts/merge-yaml.js
index b4df399..42a3cc6 100644
--- a/scripts/merge-yaml.js
+++ b/scripts/merge-yaml.js
@@ -31,12 +31,14 @@ function sortAndMergeYAMLFiles() {
             return codeA - codeB
         })
 
-        const mergedYaml = yaml.stringify(mergedData);
+        
 
-        // Construct the output string
+        // Construct the output string, removing duplicates
         let outputString = "pis:\n";
+        const seenCodes = new Set();
         mergedData.forEach(item => {
-            if (item.stops.length > 0) {
+            if (!seenCodes.has(item.code) && item.stops.length > 0) {
+                seenCodes.add(item.code);
                 outputString += `  - code: "${item.code}"\n`;
                 outputString += `    stops: [${item.stops.map(stop => `${stop}`).join(',')}]\n`;
                 outputString += `    toc: "${item.toc || "gw"}"\n`;