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1B21 1548 London Paddington to Swansea
Departing on 24th December 2025

operated by
Great Western Railway
GBTT
WTT
Route
Location
Pl
Arr
Dep
Arr
Dep
Path
Line
London Paddington [PAD]
8
1548
1548
3
Royal Oak Junction
pass
1549
2
Portobello Jn (London)
pass
1550½
2
Ladbroke Grove
pass
1551
2
ML
Acton West
pass
1553½
ML
ML
Southall [STL]
1
pass
1555½
ML
Heathrow Airport Jn
pass
1556½
ML
Slough [SLO]
2
pass
1600
ML
Maidenhead [MAI]
1
pass
1603
ML
Twyford [TWY]
1
1
pass
1606½
ML
Kennet Bridge Jn
pass
1609½
DML
Reading [RDG]
9
1611
1613
1611
1613
ML
Reading High Level Jn
pass
1614
ML
Goring & Streatley [GOR]
1
pass
1619
ML
Didcot Parkway [DID]
1
pass
1624
Wantage Road
pass
1628
Challow
pass
1630
Uffington (Oxfordshire)
1 ½
pass
1631
Swindon [SWI]
4
1638
1640
1638½
1640½
Wootton Bassett Jn
pass
1645
Hullavington
1
pass
1651½
Westerleigh Jn
½
pass
1659
Bristol Parkway [BPW]
2
1702
1704
1702½
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 and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
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