| Unit Number | Current Status | Videos | Images |
|---|
| 166 201 | Operational
Great Western Railway | Reading
Reading
Southall
West Ealing
West Ealing
Reading West
Maidenhead
Betchworth
Reigate
Reigate
Dorking West
Blackwater
Reigate
Woolston
Thornford | |
| 166 202 | Operational
Great Western Railway | Langley
Reading
Hayes & Harlington
Earlswood (Surrey)
Great Malvern
Gloucester
Freshford
Sea Mills
Sea Mills
Avoncliff
Yetminster | |
| 166 203 | Operational
Great Western Railway | Hayes & Harlington
Horley
Worle
Worle
Yatton
Keynsham
Keynsham
Freshford
Pilning
Topsham | |
| 166 204 | Operational
Great Western Railway | Reading
Earlswood
Hanwell
Hayes & Harlington
Oldfield Park
Avoncliff
Newton Abbot | |
| 166 205 | Operational
Great Western Railway | Horley
Horley
Weston-super-Mare
Bursledon
Netley | |
| 166 206 | Operational
Great Western Railway | Bradford-on-Avon
Chandler's Ford
Dean
Newton Abbot
Gloucester
Woolston
Marsh Barton
Yate
Bradford-on-Avon
Bradford-on-Avon | |
| 166 207 | Operational
Great Western Railway | West Drayton
Earlswood
Royal Oak
Iver
Bristol Parkway
Taunton
Westbury
Nailsea & Backwell
Patchway
Newport (South Wales) | |
| 166 208 | Operational
Great Western Railway | Taplow
Castle Cary
Bruton
Bristol Temple Meads
Dawlish
Montpelier
Avonmouth
Fareham | |
| 166 209 | Operational
Great Western Railway | Langley
Sydney Gardens
Dilton Marsh
Portslade
Bradford-on-Avon
Keynsham
Trowbridge
Bradford-on-Avon
Dorchester West | |
| 166 210 | Operational
Great Western Railway | West Ealing
Gatwick Airport
Torquay
Teignmouth Sea Wall | |
| 166 211 | Operational
Great Western Railway | Winnersh
Worcester Foregate Street
Stapleton Road
Bradford-on-Avon
Bedminster
Yeovil Pen Mill
Thornford
Ashley Down | Worcester Foregate Street |
| 166 212 | Operational
Great Western Railway | Newport (South Wales)
Newport (South Wales)
Chandler's Ford
Eastleigh
Warminster
Pilning
Teignmouth
Marsh Barton | |
| 166 213 | Operational
Great Western Railway | West Drayton
Langley
Maidenhead
Taplow
West Ealing
Ealing Broadway
Ealing Broadway
Bath Spa
Yate
Ashchurch for Tewkesbury | |
| 166 214 | Operational
Great Western Railway | Maidenhead
Hayes and Harlington
St Phillips Marsh Open Day
Sydney Gardens
Cardiff Central
Avoncliff
Dean
Mottisfont & Dunbridge
Warminster
Fareham
Hamble
Parson Street
Stonehouse
Kemble
Stroud | St Phillips Marsh Open Day |
| 166 215 | Operational
Great Western Railway | Hanwell
Hayes & Harlington
Bruton
Weymouth
Worle
Yatton
Bath Spa | |
| 166 216 | Operational
Great Western Railway | Slough
Dilton Marsh
Nailsea & Backwell
Stapleton Road | |
| 166 217 | Operational
Great Western Railway | Reading
West Ealing
Slough
Salfords
Horley
Dilton Marsh
Freshford
Exton
Lympstone Commando
Digby & Sowton
Dawlish
Polsoe Bridge
Avoncliff
Bath Spa
Yeovil Pen Mill | |
| 166 218 | Operational
Great Western Railway | Hanwell
Ealing Broadway
Hayes & Harlington
Redhill
Freshford
Bristol Temple Meads | |
| 166 219 | Operational
Great Western Railway | West Drayton
Iver
Hanwell
Iver
Sydney Gardens
Cardiff Central
Filton Abbey Wood
Gloucester
Keynsham
Chetnole
Cam & Dursley
Cam & Dursley
Gloucester
Bitterne
Fareham
Starcross
Frome
Yate
Avoncliff | |
| 166 220 | Operational
Great Western Railway | Redhill
Slough
Patchway
Bradford-on-Avon | |
| 166 221 | Operational
Great Western Railway | Reading
Taplow
Slough
Slough
Reading
Filton Abbey Wood
Bristol Temple Meads
Bristol Parkway
Severn Tunnel Junction
Filton Abbey Wood
Worle
Yatton
Bradford-on-Avon
Avoncliff
Westbury
Bradford-on-Avon | |