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1B21 1431 London Paddington to Swansea
Departing on 2nd January 2026

operated by
Great Western Railway
GBTT
WTT
Route
Location
Pl
Arr
Dep
Arr
Dep
Path
Line
London Paddington [PAD]
1
1431
1431
2
Royal Oak Junction
pass
1432
2
Portobello Jn (London)
pass
1433½
2
Ladbroke Grove
pass
1434
2
ML
Acton West
pass
1436½
ML
ML
Southall [STL]
1
pass
1438½
ML
Heathrow Airport Jn
pass
1439½
ML
Stockley Junction
1½
pass
1440½
ML
RL
Slough [SLO]
4
pass
1447½
RL
Slough West
pass
1448½
ML
Maidenhead [MAI]
1
pass
1453
ML
Twyford [TWY]
1
1
pass
1456½
ML
Kennet Bridge Jn
pass
1459½
DML
Reading [RDG]
7
1501
1503
1501
1503
WL
Oxford Road Jn
½
pass
1504½
Southcote Jn
pass
1506
Theale [THE]
1 2
pass
1509
Newbury [NBY]
2
Pathed as Class 80x on diesel from here
pass
1519
Bedwyn [BDW]
2½
1
pass
1530
Pewsey [PEW]
1
pass
1539
Woodborough
½
pass
1542½
Lavington
1
pass
1547½
Heywood Road Jn
pass
1553
Hawkeridge Jn
pass
1556
Bradford Jn
1
pass
1603
Bathampton Jn
pass
1615
Bath Spa [BTH]
1 ½
1
1619
1621
1619
1621
North Somerset Jn
1
pass
1631
DM
Bristol East Jn
pass
1632½
UM
Bristol Temple Meads [BRI]
Service reverses here
13
1634
1643
1634
1643
DF
Bristol East Jn
pass
1644
UF
Dr Day's Jn
1
pass
1645
ML
Horfield Junction
pass
1649
Filton Abbey Wood [FIT]
2
pass
1650½
DF
Bristol Parkway [BPW]
Pathed as Class 80x on electric from here
Service reverses here
2
1652
1704
1653
1704½
Patchway [PWY]
2
pass
1706
Pilning [PIL]
2
pass
1708½
Severn Tunnel East
pass
1709½
Severn Tunnel West
pass
1713
Severn Tunnel Junction [STJ]
3
pass
1714
ML
Llanwern West Jn
pass
1719
Maindee East Jn
pass
1720½
ML
Maindee West Jn
pass
1721
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
DM
Gaer Jn
pass
1725½
ML
Ebbw Jn
pass
1726½
Marshfield
1
pass
1729
Moorland Road Junction
1
pass
1733½
RL
Long Dyke Jn
pass
1735
E
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
D
Leckwith North Jn
pass
1742½
Pontyclun [PYC]
pass
1750½
Bridgend [BGN]
1
1758
1800
1758
1800
Stormy
½
pass
1804½
Margam Moors Jn.
pass
1807½
Margam East Jn
pass
1808½
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
Court Sart Jn
pass
1816½
Neath [NTH]
1 2½
1819
1820
1818½
1820
Swansea Loop East
pass
1832
Swansea [SWA]
joins with 1L34 towards London Paddington
3
1834
1834
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