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1B21 1548 London Paddington to Swansea
Departing on 8th January 2026

operated by
Great Western Railway
10 coaches
800032
800010
GBTT
WTT
RTTRealtime
Route
Mi.Ch
Location
Pl
Arr
Dep
Arr
Dep
Arr
Dep
Dly
Path
Line
0.00
London Paddington [PAD]
Pathed as Class 80x on electric at 125mph
1
1548
1548
1547¾
1
0.41
Royal Oak Junction
pass
1549
pass
1549
1.28
Portobello Jn (London)
pass
1550½
pass
1550¼
1.68
Ladbroke Grove
pass
1551
pass
1551
1
DM
2.55
Old Oak Common East
pass
1551½
pass
1551¾
3.15
Old Oak Common West
pass
1552
pass
1552¼
3.48
Friars Jn
pass
1552½
pass
1552½
4.16
Acton Main Line [AML]
pass
1553
pass
1553¼
4.75
Acton West
pass
1553½
pass
1553½
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1554
6.41
West Ealing [WEA]
pass
1554½
pass
1554½
6.49
West Ealing Junction
pass
1554½
pass
1554½
7.23
Hanwell [HAN]
pass
1554½
pass
1554¾
8.57
Southall East Jn
pass
1555½
pass
1555½
9.01
Southall [STL]
1
pass
1555½
pass
1556
9.65
Southall West Jn
pass
1556
pass
1556
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1556¾
11.09
Heathrow Airport Jn
pass
1556½
pass
1556½
ML
12.04
Stockley Junction
pass
1557
pass
1557
12.62
West Drayton East
pass
1557½
pass
1557½
13.12
West Drayton [WDT]
1
pass
1557½
pass
1558
13.26
West Drayton Jcn
pass
1557½
pass
1558
14.55
Iver [IVR]
1
pass
1558
pass
1558½
16.13
Langley [LNY]
1
pass
1559
pass
1559¾
17.13
Dolphin Jn
pass
1559½
pass
1600¼
18.31
Slough [SLO]
2
pass
1600
pass
1601
+1
ML
19.06
Slough West
pass
1600½
pass
1601¼
+1
20.72
Burnham [BNM]
pass
1601½
pass
1602¼
+1
22.34
Taplow [TAP]
1
pass
1602
pass
1603¼
+1
23.53
Maidenhead East
pass
1602½
pass
1604
+1
24.14
Maidenhead [MAI]
1
pass
1603
pass
1604½
+1
29.40
Ruscombe
pass
1606
pass
1606¾
+1
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1607½
+1
ML
31.57
Twyford West
pass
1607
pass
1607¾
35.10
Kennet Bridge Jn
pass
1609½
pass
1611¼
+1
35.56
Reading Main Line East
pass
1610
pass
1613
+3
35.75
Reading [RDG]
9
1611
1613
1611
1613
1614¼
1617
+4
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1617¾
+4
36.45
Reading High Level Jn
pass
1614
pass
1618½
+4
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1619¾
+4
38.47
Tilehurst [TLH]
1
pass
1615
pass
1619¾
+4
41.38
Pangbourne [PAN]
pass
1617
pass
1621
+4
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1623
+4
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1624½
+3
51.32
Moreton Cutting
pass
1623
pass
1626
+3
52.61
Didcot East Jn
pass
1624
pass
1626¾
+3
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1628¼
+4
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1628¾
+4
55.14
Milton Junction
pass
1625
pass
1629¼
+4
56.27
Steventon
pass
1626
pass
1630¼
+4
60.17
Wantage Road
pass
1628
pass
1634¼
+6
63.75
Challow
pass
1630
pass
1637¼
+7
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1638¼
+7
72.25
Bourton
pass
1635
pass
1641¼
+6
74.46
Swindon South Marston Jn
pass
1636½
pass
1642¼
+6
75.58
Swindon Stratton Green
pass
1637
pass
1643½
+6
76.27
Highworth Jn
pass
1637½
pass
1643¾
+6
76.59
Swindon East Loop
pass
1637½
pass
1644¾
+7
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1645¾
1647½
+7
DM
DM
78.31
Rushey Platt
pass
1642
pass
1649
+7
82.67
Wootton Bassett Jn
pass
1645
pass
1652
+7
DM
DB
89.57
Little Somerford
pass
1649
pass
1656
+7
94.16
Hullavington
1
pass
1651½
pass
1658½
+7
99.76
Badminton
pass
1655
pass
1701
+6
104.40
Chipping Sodbury
pass
1657½
pass
1704
+6
107.09
Westerleigh Jn
½
pass
1659
pass
1705¾
+6
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1709¾
1711¾
+7
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1713¼
+7
116.45
Pilning [PIL]
2
pass
1708½
pass
1716¼
+7
118.03
Severn Tunnel East
pass
1709½
pass
1717¼
+7
122.31
Severn Tunnel West
pass
1713
pass
1720½
+7
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1722
+8
DT
DM
125.66
Magor
pass
1715½
pass
1723½
+7
130.72
Llanwern West Jn
pass
1719
pass
1727
+8
131.63
East Usk Jn.
pass
1719½
pass
1727½
+7
132.55
Maindee East Jn
pass
1720½
pass
1728½
+8
ML
132.77
Maindee West Jn
pass
1721
pass
1729¼
+8
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1730½
1732
+8
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1733¾
+8
DM
134.68
Ebbw Jn
pass
1726½
pass
1734½
+8
DM
DM
138.41
Marshfield
1
pass
1729
pass
1737¼
+8
142.42
Rumney River Bridge Jn
pass
1732½
pass
1739½
+7
143.01
Pengam Jn
pass
1733
pass
1740
+7
143.46
Moorland Road Junction
1
pass
1733½
pass
1740½
+7
RL
144.16
Long Dyke Jn
pass
1735
pass
1741½
+6
E
144.79
Cardiff East
pass
1736½
pass
1742½
+6
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
4
1737
1739
1737½
1739½
1744
1745¾
+6
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1748¾
+6
D
DM
149.14
St Fagans L C
pass
1744½
pass
1751
+6
154.08
Miskin
pass
1748½
pass
1755
+6
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1757
+6
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1759
+6
161.41
Pencoed [PCD]
1
pass
1754½
pass
1801
+6
164.42
Tremains
pass
1757
pass
1803
+6
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1804¾
1806¼
+6
DM
DM
169.46
Stormy
½
pass
1804½
pass
1811
+6
171.21
Pyle [PYL]
1
pass
1806
pass
1812
+6
173.45
Margam Moors Jn.
pass
1807½
pass
1813¼
+5
DM
175.12
Margam East Jn
pass
1808½
pass
1814½
+6
176.00
Margam Middle Jn
pass
1809
pass
1814¾
+5
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1817¾
1842½
+30
179.38
Baglan [BAJ]
1
pass
1814½
pass
1845½
+30
180.09
Briton Ferry East
pass
1815½
pass
1845¾
+30
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1847
+30
181.38
Court Sart Jn
pass
1816½
pass
1846¾
+30
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1848½
1849¾
+29
185.06
Skewen [SKE]
1
pass
1824
pass
1852¾
+29
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1854½
+28
189.42
Landore Junction
pass
1831
pass
1857¼
+26
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1858¾
+26
190.67
Swansea [SWA]
joins with 1L34 towards London Paddington and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
1901
+27
DSM
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