diff --git a/static/mapFiles/yaml/2421.yaml b/static/mapFiles/yaml/2421.yaml
new file mode 100644
index 0000000..c38dfd9
--- /dev/null
+++ b/static/mapFiles/yaml/2421.yaml
@@ -0,0 +1,713 @@
+routeStart: Gloucester
+routeEnd: Severn Tunnel Jn
+routeId: 2420
+updated: 2026-02-28
+checked: 
+signallerStart: Gloucester PSB
+signallerEnd: SWCC Severn Tunnel WS
+elecStart:
+  elec: none
+elecEnd:
+  elec: 25kvac
+  eco: Didcot (TVSC)
+
+routeDetail:
+
+  - type: continues
+    routeName: Gloucester - Westerleigh Jn
+    entryPoint: gloucester
+    routeId: '2420'
+
+  - type: station
+    name: Gloucester
+    miles: 114
+    chains: 4
+
+  - type: minorBridge
+    name: Gloucester Viaduct
+    miles: 114
+    chains: 20
+    position: under
+    category: road
+
+  - type: crossovers
+    name: Gloucester West
+    miles: 114
+    chains: 40
+
+  - type: minorBridge
+    name: St. Catherines Street
+    position: under
+    category: road
+    miles: 114
+    chains: 47
+
+  - type: minorBridge
+    name: St. Oswalds Road
+    position: under
+    category: road
+    miles: 114
+    chains: 54
+
+  - type: minorBridge
+    name: St. Catherines Meadow Viaduct
+    position: under
+    miles: 115
+    chains: 2
+
+  - type: bridge
+    name: River Severn
+    position: under
+    category: waterway
+    miles: 114
+    chains: 10
+
+  - type: minorBridge
+    name: Ham Meadow Viaduct
+    position: under
+    miles: 115
+    chains: 20
+
+  - type: minorBridge
+    name: Over Causeway
+    position: over
+    category: aroad
+    roadName: A417
+    miles: 115
+    chains: 32
+
+  - type: minorBridge
+    position: under
+    miles: 115
+    chains: 37
+
+  - type: crossovers
+    name: Over Jn
+    miles: 115
+    chains: 43
+
+  - type: bridge
+    position: under
+    category: waterway
+    name: River Severn
+    miles: 115
+    chains: 48
+
+  - type: crossing
+    kind: uwc
+    name: Keens Crossing
+    miles: 116
+    chains: 3
+  
+  - type: crossing
+    kind: foot
+    name: Over Farm Foot Crossing
+    miles: 116
+    chains: 48
+
+  - type: minorBridge
+    position: under
+    miles: 116
+    chains: 40
+
+  - type: crossing
+    category: uwc
+    name: Poole's Crossing
+    miles: 116
+    chains: 46
+
+  - type: minorBridge
+    position: under
+    miles: 116
+    chains: 64
+
+  - type: minorBridge
+    category: aroad
+    name: A48
+    roadName: A48
+    position: over
+    miles: 117
+    chains: 5
+
+  - type: crossing
+    kind: foot
+    name: Hygrove Foot Crossing
+    miles: 117
+    chains: 39
+
+  - type: crossing
+    kind: uwc
+    name: Lower Barn Foot Crossing
+    miles: 118
+    chains: 17
+
+  - type: crossing
+    kind: foot
+    name: Churcham Court Foot Crossing
+    miles: 118
+    chains: 48
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: over
+    miles: 118
+    chains: 55
+
+  - type: crossing
+    kind: foot
+    name: Churcham 66 Foot Crossing
+    miles: 118
+    chains: 69
+
+  - type: minorBridge
+    name: Oakle Street
+    position: over
+    category: road
+    miles: 119
+    chains: 35
+
+  - type: crossing
+    kind: foot
+    name: Oakle St No.1 Foot Crossing
+    miles: 119
+    chains: 59
+
+  - type: crossing
+    kind: foot
+    name: Oakle St No.2 Foot Crossing
+    miles: 119
+    chains: 66
+
+  - type: crossing
+    kind: foot
+    name: Hooks Farm Foot Crossing
+    miles: 120
+    chains: 1
+
+  - type: crossing
+    kind: cctv
+    name: Ley Level Crossing
+    description: CCTV by Gloucester
+    miles: 120
+    chains: 20
+
+  - type: crossing
+    kind: uwc
+    name: Broken Cross Farm No.1 Crossing
+    miles: 120
+    chains: 49
+
+  - type: crossing
+    kind: R/G
+    name: Broken Cross Farm Level Crossing
+    miles: 120
+    chains: 66
+
+  - type: minorBridge
+    position: over
+    name: Grange Court Road
+    miles: 121
+    chains: 50
+
+  - type: crossing
+    kind: AHB
+    name: Westbury Level Crossing
+    miles: 122
+    chains: 11
+
+  - type: crossing
+    kind: foot
+    name: Longcroft Farm Foot Crossing
+    miles: 122
+    chains: 20
+
+  - type: crossing
+    kind: foot
+    name: Westbury Brook Foot Crossing
+    miles: 122
+    chains: 51
+
+  - type: minorBridge
+    position: under
+    name: Westbury-on-Severn Lane
+    miles: 122
+    chains: 72
+    category: road
+
+  - type: minorBridge
+    position: under
+    name: Jordan Hill
+    roadName: A48
+    category: aroad
+    miles: 122
+    chains: 78
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: under
+    miles: 123
+    chains: 33
+
+  - type: minorBridge
+    name: Cattle Creep
+    position: under
+    miles: 123
+    chains: 53
+
+  - type: crossing
+    kind: OMSL
+    name: Broadoak Crossing
+    miles: 123
+    chains: 76
+
+  - type: minorBridge
+    name: Broad Oak Bridge
+    roadName: A48
+    category: aroad
+    position: under
+    miles: 124
+    chains: 5
+
+  - type: minorBridge
+    name: Cattle Creep
+    position: under
+    miles: 124
+    chains: 25
+
+  - type: minorBridge
+    name: Hawkins Lane
+    category: road
+    position: under
+    miles: 124
+    chains: 40
+
+  - type: minorBridge
+    name: Cattle Creep
+    position: under
+    miles: 124
+    chains: 45
+
+  - type: minorBridge
+    position: over
+    name: Hyde Lane
+    category: road
+    miles: 125
+    chains: 3
+
+  - type: signallerChange
+    from: Gloucester PSB (G)
+    to: SWCC Severn Tunnel Workstation (NT)
+
+  - type: tunnel
+    tunnelType: whole
+    length: 0mi 235yd
+    name: Newnham Tunnel
+    miles: 125
+    chains: 14
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: over
+    miles: 125
+    chains: 26
+
+  - type: crossing
+    kind: uwc
+    name: Ruddle Bridge Crossing
+    miles: 125
+    chains: 37
+
+  - type: minorBridge
+    name: Ruddle Road Bridge
+    roadName: A48
+    position: under
+    category: aroad
+    miles: 125
+    chains: 47
+
+  - type: crossing
+    kind: foot
+    name: Bullo Pill Foot Crossing
+    miles: 126
+    chains: 35
+
+  - type: minorBridge
+    name: Bullo Dock Viaduct
+    position: under
+    category: road
+    miles: 126
+    chains: 39
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: over
+    miles: 126
+    chains: 74
+
+  - type: minorBridge
+    name: Awre Road Cockshoot Bridge
+    position: over
+    miles: 127
+    chains: 34
+
+  - type: crossing
+    kind: foot
+    name: Awre 15 Foot Crossing
+    miles: 128
+    chains: 9
+
+  - type: crossing
+    kind: CCTV
+    name: Awre Level Crossing
+    miles: 128
+    chains: 22
+    description: CCTV by SWCC
+
+  - type: minorBridge
+    name: Hewletts Road
+    position: over
+    category: road
+    miles: 128
+    chains: 46
+
+  - type: crossing
+    kind: foot
+    name: Awre 87 Foot Crossing
+    miles: 129
+    chains: 7
+
+  - type: crossing
+    kind: foot
+    name: Milkmaid Head Foot Crossing
+    miles: 129
+    chains: 45
+
+  - type: crossing
+    kind: foot
+    name: Gatcombe Foot Crossing
+    miles: 129
+    chains: 61
+
+  - type: crossing
+    kind: uwc
+    name: Aldridge Crossing
+    miles: 130
+    chains: 65
+
+  - type: minorBridge
+    name: Cliff Farm Bridge
+    position: over
+    miles: 131
+    chains: 79
+
+  - type: crossing
+    kind: foot
+    name: Plummers Farm Foot Crossing
+    miles: 132
+    chains: 19
+
+  - type: crossing
+    kind: AHB
+    name: Naas Level Crossing
+    miles: 132
+    chains: 68
+
+  - type: crossing
+    kind: foot
+    name: Lydney Foot Crossing
+    miles: 132
+    chains: 71
+
+  - type: loop
+    position: both
+    name: Lydney Goods Loops
+    description: Up loop gives access to Dean Forest Railway
+    miles: 133
+    chains: 21
+
+  - type: station
+    name: Lydney
+    miles: 133
+    chains: 37
+
+  - type: crossing
+    kind: CCTV
+    name: Lydney Level Crossing
+    description: CCTV by SWCC
+    miles: 133
+    chains: 40
+
+  - type: minorBridge
+    name: The Lyd
+    position: under
+    category: stream
+    miles: 133
+    chains: 42
+
+  - type: minorBridge
+    position: under
+    category: road
+    miles: 133
+    chains: 45
+
+  - type: crossing
+    kind: uwc
+    name: Garlands No.1 Crossing
+    miles: 133
+    chains: 72
+
+  - type: minorBridge
+    name: Garlands Bridge
+    position: under
+    miles: 134
+    chains: 26
+
+  - type: crossing
+    kind: uwc
+    name: Stockwell Lane Crossing
+    miles: 134
+    chains: 53
+
+  - type: crossing
+    kind: foot
+    name: Hardacre No.1 Foot Crossing
+    miles: 134
+    chains: 62
+
+  - type: crossing
+    kind: uwc
+    name: Hardacre No.2 Crossing
+    miles: 135
+    chains: 4
+
+  - type: crossing
+    kind: foot
+    name: Alvington 17 Foot Crossing
+    miles: 134
+    chains: 66
+
+  - type: crossing
+    kind: foot
+    name: Alvington 18 Foot Crossing
+    miles: 135
+    chains: 38
+
+  - type: crossing
+    kind: foot
+    name: Woolaston 117 Foot Crossing
+    miles: 135
+    chains: 56
+
+  - type: crossing
+    kind: foot
+    name: Woolaston 118 Foot Crossing
+    miles: 135
+    chains: 77
+
+  - type: crossing
+    kind: R/G
+    name: Woolaston Level Crossing
+    miles: 136
+    chains: 14
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: over
+    miles: 136
+    chains: 27
+
+  - type: crossing
+    kind: uwc
+    name: High Hall Crossing
+    miles: 138
+    chains: 14
+
+  - type: minorBridge
+    name: Pill House Bridge
+    position: over
+    category: road
+    miles: 139
+    chains: 9
+
+  - type: minorBridge
+    name: Farm Bridge
+    position: under
+    miles: 139
+    chains: 56
+
+  - type: minorBridge
+    name: Snipe Hill Bridge
+    position: over
+    category: road
+    miles: 140
+    chains: 22
+
+  - type: minorBridge
+    name: Mead School Bridge
+    position: over
+    category: road
+    miles: 140
+    chains: 35
+
+  - type: minorBridge
+    name: Sedbury Lane
+    position: over
+    category: road
+    miles: 140
+    chains: 55
+
+  - type: tunnel
+    tunnelType: whole
+    name: Chepstow Tunnel
+    length: 0mi 359yd
+    description: May be illuminated
+    miles: 140
+    chains: 69
+
+  - type: minorBridge
+    name: Beachley Road
+    position: over
+    category: road
+    miles: 141
+    chains: 0
+
+  - type: bridge
+    name: Chepstow Bridge
+    position: under
+    category: waterway
+    description: Crosses River Wye
+    miles: 141
+    chains: 10
+
+  - type: station
+    name: Chepstow
+    miles: 141
+    chains: 33
+
+  - type: bridge
+    name: Motorway
+    position: over
+    category: motorway
+    roadName: M48
+    miles: 143
+    chains: 4
+
+  - type: crossing
+    kind: uwc
+    name: Sharpe's Crossing
+    miles: 143
+    chains: 15
+
+  - type: crossing
+    kind: OMSL
+    name: Three Gates Crossing
+    miles: 143
+    chains: 35
+
+  - type: crossing
+    kind: uwc
+    name: Curb Hut Crossing
+    miles: 144
+    chains: 6
+
+  - type: minorBridge
+    name: Redcliffe Bridge
+    position: over
+    miles: 144
+    chains: 40
+
+  - type: crossing
+    kind: OMSL
+    name: Mathern 21 Foot Crossing
+    miles: 144
+    chains: 68
+
+  - type: crossing
+    name: Ifton Hill Farm Crossing
+    kind: uwc
+    miles: 145
+    chains: 11
+
+  - type: minorBridge
+    name: New Passage Road
+    position: over
+    category: road
+    miles: 145
+    chains: 67
+
+  - type: minorBridge
+    category: foot
+    position: over
+    miles: 146
+    chains: 0
+
+  - type: minorBridge
+    name: Portskewett Road
+    position: over
+    miles: 146
+    chains: 32
+
+  - type: crossing
+    name: Caldicot Level Crossing
+    kind: cctv
+    description: CCTV by SWCC
+    miles: 147
+    chains: 4
+
+  - type: crossing
+    name: Rhymers Crossing
+    kind: uwc
+    miles: 147
+    chains: 25
+
+  - type: minorBridge
+    name: Caldicot Road Bridge
+    position: over
+    category: road
+    miles: 147
+    chains: 51
+
+  - type: crossing
+    kind: uwc
+    name: Caldicot Station Crossing
+    miles: 148
+    chains: 0
+
+  - type: station
+    name: Caldicot
+    miles: 148
+    chains: 2
+
+  - type: electrificationChange
+    from:
+      elec: none
+    to:
+      elec: 25kvac
+      eco: Didcot
+    miles: 148
+    chains: 50
+
+  - type: minorBridge
+    name: Ifton Tramway Underbridge
+    position: under
+    miles: 148
+    chains: 50
+
+  - type: station
+    name: Severn Tunnel Junction
+    description: Platforms 1 & 2 on this line of route
+    miles: 148
+    chains: 61
+
+  - type: junction
+    name: Severn Tunnel Junction
+    diverges: left
+    direction: up
+    description: to Bristol via Severn Tunnel
+    goto: '0000'
+    entryPoint: severn-tunnel-junction
+
+  - type: continues
+    routeName: Bristol Parkway - Cardiff West Shunt
+    routeId: '0000'
+    entryPoint: severn-tunnel-junction
\ No newline at end of file