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1B21 1548 London Paddington to Swansea
Departing on 23rd December 2025

operated by
Great Western Railway
GBTT
WTT
RTTRealtime
Route
Mi.Ch
Location
Pl
Arr
Dep
Arr
Dep
Arr
Dep
Dly
Path
Line
0.00
London Paddington [PAD]
8
1548
1548
1548
3
0.41
Royal Oak Junction
pass
1549
pass
1549
2
1.28
Portobello Jn (London)
pass
1550½
pass
1550
2
1.68
Ladbroke Grove
pass
1551
pass
1551
2
ML
2.55
Old Oak Common East
pass
1551½
pass
1551
3.15
Old Oak Common West
pass
1552
pass
1552
3.48
Friars Jn
pass
1552½
pass
1552
4.16
Acton Main Line [AML]
pass
1553
pass
1552
4.75
Acton West
pass
1553½
pass
1553
ML
ML
5.51
Ealing Broadway [EAL]
pass
1554
pass
1553
6.41
West Ealing [WEA]
pass
1554½
pass
1554
6.49
West Ealing Junction
pass
1554½
pass
1554
7.23
Hanwell [HAN]
pass
1554½
pass
1554
8.57
Southall East Jn
pass
1555½
pass
1555
9.01
Southall [STL]
1
pass
1555½
pass
1555
ML
9.65
Southall West Jn
pass
1556
pass
1555
10.66
Hayes & Harlington [HAY]
pass
1556½
pass
1556
11.09
Heathrow Airport Jn
pass
1556½
pass
1556
ML
12.04
Stockley Junction
pass
1557
pass
1556
12.62
West Drayton East
pass
1557½
pass
1557
13.12
West Drayton [WDT]
pass
1557½
pass
1557
13.26
West Drayton Jcn
pass
1557½
pass
1557
14.55
Iver [IVR]
pass
1558
pass
1558
16.13
Langley [LNY]
pass
1559
pass
1558
17.13
Dolphin Jn
pass
1559½
pass
1559
18.31
Slough [SLO]
2
pass
1600
pass
1600
ML
19.06
Slough West
pass
1600½
pass
1600
20.72
Burnham [BNM]
pass
1601½
pass
1601
22.34
Taplow [TAP]
pass
1602
pass
1602
23.53
Maidenhead East
pass
1602½
pass
1602
24.14
Maidenhead [MAI]
1
pass
1603
pass
1603
ML
29.40
Ruscombe
pass
1606
pass
1605
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1606
ML
31.57
Twyford West
pass
1607
pass
1606
35.10
Kennet Bridge Jn
pass
1609½
pass
1609
DML
35.56
Reading Main Line East
pass
1610
pass
1610
35.75
Reading [RDG]
9
1611
1613
1611
1613
1610
1613
ML
36.12
Reading Main Line West
pass
1613½
pass
1613
36.45
Reading High Level Jn
pass
1614
pass
1614
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1615
38.47
Tilehurst [TLH]
pass
1615
pass
1615
41.38
Pangbourne [PAN]
pass
1617
pass
1617
44.55
Goring & Streatley [GOR]
1
pass
1619
pass
1619
ML
48.32
Cholsey [CHO]
pass
1621
pass
1621
51.32
Moreton Cutting
pass
1623
pass
1622
52.61
Didcot East Jn
pass
1624
pass
1623
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1623
53.20
Didcot West End
pass
1624
pass
1623
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624
55.14
Milton Junction
pass
1625
pass
1625
56.27
Steventon
pass
1626
pass
1625
60.17
Wantage Road
pass
1628
pass
1627
63.75
Challow
pass
1630
pass
1629
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1630
72.25
Bourton
pass
1635
pass
1634
74.46
Swindon South Marston Jn
pass
1636½
pass
1636
75.58
Swindon Stratton Green
pass
1637
pass
1637
76.27
Highworth Jn
pass
1637½
pass
1637
76.59
Swindon East Loop
pass
1637½
pass
1637
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1638
1640
82.67
Wootton Bassett Jn
pass
1645
pass
1644
89.57
Little Somerford
pass
1649
pass
1648
94.16
Hullavington
1
pass
1651½
pass
1651
99.76
Badminton
pass
1655
pass
1654
104.40
Chipping Sodbury
pass
1657½
pass
1656
107.09
Westerleigh Jn
½
pass
1659
pass
1658
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1702
1704
112.79
Patchway [PWY]
2
pass
1706
pass
1705
116.45
Pilning [PIL]
2
pass
1708½
pass
1708
118.03
Severn Tunnel East
pass
1709½
pass
1709
122.31
Severn Tunnel West
pass
1713
pass
1712
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1713
ML
125.66
Magor
pass
1715½
pass
1715
130.72
Llanwern West Jn
pass
1719
pass
1718
131.63
East Usk Jn.
pass
1719½
pass
1719
132.55
Maindee East Jn
pass
1720½
pass
1720
ML
132.77
Maindee West Jn
pass
1721
pass
1720
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1721
1724
DM
134.13
Gaer Jn
pass
1725½
pass
1725
ML
134.68
Ebbw Jn
pass
1726½
pass
1726
138.41
Marshfield
1
pass
1729
pass
1729
142.42
Rumney River Bridge Jn
pass
1732½
pass
1732
143.01
Pengam Jn
pass
1733
pass
1733
143.46
Moorland Road Junction
1
pass
1733½
pass
1733
RL
144.16
Long Dyke Jn
pass
1735
pass
1734
E
144.79
Cardiff East
pass
1736½
pass
1736
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1737
1739
D
145.37
Cardiff West
pass
1740½
pass
1740
146.36
Leckwith North Jn
pass
1742½
pass
1742
149.14
St Fagans L C
pass
1744½
pass
1744
154.08
Miskin
pass
1748½
pass
1748
156.21
Pontyclun [PYC]
pass
1750½
pass
1750
156.57
Llantrisant [LTI]
pass
1751
pass
1750
158.53
Llanharan [LLR]
pass
1752½
pass
1751
161.41
Pencoed [PCD]
pass
1754½
pass
1754
164.42
Tremains
pass
1757
pass
1756
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1757
1800
169.46
Stormy
½
pass
1804½
pass
1804
171.21
Pyle [PYL]
pass
1806
pass
1805
173.45
Margam Moors Jn.
pass
1807½
pass
1807
175.12
Margam East Jn
pass
1808½
pass
1808
176.00
Margam Middle Jn
pass
1809
pass
1809
176.70
Port Talbot East
pass
1810
pass
1809
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1811
1812
179.38
Baglan [BAJ]
pass
1814½
pass
1814
180.09
Briton Ferry East
pass
1815½
pass
1814
181.20
Briton Ferry [BNF]
pass
1816½
pass
1815
181.38
Court Sart Jn
pass
1816½
pass
1816
183.00
Neath [NTH]
1 2½
1819
1820
1818½
1820
1818
1820
185.06
Skewen [SKE]
pass
1824
pass
1823
186.68
Llansamlet [LAS]
pass
1826½
pass
1826
189.42
Landore Junction
pass
1831
pass
1830
190.23
Swansea Loop East
pass
1832
pass
1832
190.67
Swansea [SWA]
joins with 1L34 towards London Paddington and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
1834
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