diff --git a/src/lib/stores/tocMap.ts b/src/lib/stores/tocMap.ts
index ebdbc29..55890e8 100644
--- a/src/lib/stores/tocMap.ts
+++ b/src/lib/stores/tocMap.ts
@@ -1,7 +1,7 @@
 export const tocs = new Map<string, string>([
   ['gw', 'Great Western Railway'],
   ['sw', 'South Western Railway'],
-  ['id', 'Island Line'],
+  ['il', 'Island Line'],
   ['nt', 'Northern'],
   ['aw', 'Transport for Wales'],
   ['cc', 'c2c'],