Add station modal logic and station data for part of route 0210

static/mapFiles/yaml/2421.yaml

@@ -1,7 +1,7 @@
 # yaml-language-server: $schema=./mapFiles.schema.json
 routeStart: Gloucester
 routeEnd: Severn Tunnel Jn
-routeId: "2421"
+routeId: '2421'
 updated: 2026-02-28
 checked: 2026-03-01
 signallerStart: Gloucester PSB
@@ -13,7 +13,6 @@ elecEnd:
   eco: Didcot (TVSC)
 
 routeDetail:
-
   - type: continues
     routeName: Gloucester - Westerleigh Jn
     entryPoint: gloucester
@@ -102,7 +101,7 @@ routeDetail:
     name: Keens Crossing
     miles: 116
     chains: 3
-  
+
   - type: crossing
     kind: foot
     name: Over Farm Foot Crossing
@@ -736,4 +735,4 @@ routeDetail:
   - type: continues
     routeName: Bristol Parkway - Cardiff West Shunt
     routeId: '0000'
-    entryPoint: severn-tunnel-junction
+    entryPoint: severn-tunnel-junction