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1B21 1546 London Paddington to Swansea
Departing on 29th December 2025

operated by
Great Western Railway
GBTT
WTT
Route
Location
Pl
Arr
Dep
Arr
Dep
Path
Line
London Paddington [PAD]
4
1546
1546
2
Royal Oak Junction
pass
1547
2
Portobello Jn (London)
pass
1548
2
Ladbroke Grove
pass
1549
2
ML
Acton West
pass
1551½
ML
ML
Southall [STL]
1
1
pass
1553½
ML
Heathrow Airport Jn
pass
1555½
ML
Slough [SLO]
2
pass
1559
ML
Maidenhead [MAI]
1
pass
1602
ML
Twyford [TWY]
1
1
pass
1605½
ML
Kennet Bridge Jn
pass
1608½
DML
Reading [RDG]
9
1610
1613
1610
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]
Pathed as Class 80x on diesel from here
2
1722
1724
1722
1724
DM
Gaer Jn
pass
1725½
ML
Ebbw Jn
4
pass
1726½
Marshfield
1 3
pass
1733
Long Dyke Jn
pass
1741
E
Cardiff Central [CDF]
4
1745
1746
1744
1746
Cardiff Radyr Branch Jn
pass
1748
Penarth Curve North Jn
2
pass
1749
Ninian Park [NNP]
1
pass
1752
Leckwith North Jn
pass
1753
Pontyclun [PYC]
pass
1801½
Bridgend [BGN]
1
1809
1810
1809
1810½
Stormy
pass
1815
Margam Moors Jn.
pass
1817½
Margam East Jn
pass
1818½
Port Talbot Parkway [PTA]
1
1821
1822
1821
1822½
Court Sart Jn
pass
1826½
Neath [NTH]
1
1829
1830
1828½
1830
Swansea Loop East
pass
1839½
Swansea [SWA]
joins with 1L34 towards London Paddington
3
1841
1841
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