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1B21 1548 London Paddington to Swansea
Departing on 5th January 2026

operated by
Great Western Railway
10 coaches
800001
800033
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
8
1548
1548
1555½
+7
3
0.41
Royal Oak Junction
pass
1549
pass
1556½
+7
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1557½
+7
1.68
Ladbroke Grove
pass
1551
pass
1558¼
+7
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1559¼
+7
3.15
Old Oak Common West
pass
1552
pass
1559¾
+7
3.48
Friars Jn
pass
1552½
pass
1600
+7
4.16
Acton Main Line [AML]
pass
1553
pass
1600¾
+7
4.75
Acton West
pass
1553½
pass
1601
+7
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1601½
+7
6.41
West Ealing [WEA]
pass
1554½
pass
1602
+7
6.49
West Ealing Junction
pass
1554½
pass
1602
+7
7.23
Hanwell [HAN]
pass
1554½
pass
1602¼
+7
8.57
Southall East Jn
pass
1555½
pass
1603
+7
9.01
Southall [STL]
1
pass
1555½
pass
1603½
+8
9.65
Southall West Jn
pass
1556
pass
1603½
+7
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1604¼
+8
11.09
Heathrow Airport Jn
pass
1556½
pass
1604¼
+7
ML
12.04
Stockley Junction
pass
1557
pass
1604½
+7
12.62
West Drayton East
pass
1557½
pass
1605
+7
13.12
West Drayton [WDT]
1
pass
1557½
pass
1605½
+8
13.26
West Drayton Jcn
pass
1557½
pass
1605½
+8
14.55
Iver [IVR]
1
pass
1558
pass
1606
+7
16.13
Langley [LNY]
1
pass
1559
pass
1607
+8
17.13
Dolphin Jn
pass
1559½
pass
1607½
+8
18.31
Slough [SLO]
2
pass
1600
pass
1608½
+8
ML
19.06
Slough West
pass
1600½
pass
1608¾
+8
20.72
Burnham [BNM]
pass
1601½
pass
1609¾
+8
22.34
Taplow [TAP]
1
pass
1602
pass
1610¾
+8
23.53
Maidenhead East
pass
1602½
pass
1611½
+8
24.14
Maidenhead [MAI]
1
pass
1603
pass
1612
+9
29.40
Ruscombe
pass
1606
pass
1614
+8
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1614¾
+8
ML
31.57
Twyford West
pass
1607
pass
1615¼
+8
35.10
Kennet Bridge Jn
pass
1609½
pass
1617¾
+8
35.56
Reading Main Line East
pass
1610
pass
1619½
+9
35.75
Reading [RDG]
9
1611
1613
1611
1613
1620¾
1624¾
+11
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1625¼
+11
36.45
Reading High Level Jn
pass
1614
pass
1626¼
+12
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1627¼
+12
38.47
Tilehurst [TLH]
1
pass
1615
pass
1627¼
+12
41.38
Pangbourne [PAN]
pass
1617
pass
1628½
+11
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1630½
+11
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1632¼
+11
51.32
Moreton Cutting
pass
1623
pass
1635¾
+12
52.61
Didcot East Jn
pass
1624
pass
1636¾
+12
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1637¼
+13
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1637¾
+13
55.14
Milton Junction
pass
1625
pass
1638
+13
56.27
Steventon
pass
1626
pass
1639
+13
60.17
Wantage Road
pass
1628
pass
1643¾
+15
63.75
Challow
pass
1630
pass
1646½
+16
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1647¾
+16
72.25
Bourton
pass
1635
pass
1650½
+15
74.46
Swindon South Marston Jn
pass
1636½
pass
1652
+15
75.58
Swindon Stratton Green
pass
1637
pass
1653½
+16
76.27
Highworth Jn
pass
1637½
pass
1654
+16
76.59
Swindon East Loop
pass
1637½
pass
1655¼
+17
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1656
1657¾
+17
DM
DM
78.31
Rushey Platt
pass
1642
pass
1659¼
+17
82.67
Wootton Bassett Jn
pass
1645
pass
1702½
+17
DM
DB
89.57
Little Somerford
pass
1649
pass
1706¾
+18
94.16
Hullavington
1
pass
1651½
pass
1709¼
+17
99.76
Badminton
pass
1655
pass
1711½
+16
104.40
Chipping Sodbury
pass
1657½
pass
1714½
+17
107.09
Westerleigh Jn
½
pass
1659
pass
1716½
+17
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1723
1726½
+22
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1728
+22
116.45
Pilning [PIL]
2
pass
1708½
pass
1731
+22
118.03
Severn Tunnel East
pass
1709½
pass
1731¾
+22
122.31
Severn Tunnel West
pass
1713
pass
1735
+22
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1736½
+22
DT
DM
125.66
Magor
pass
1715½
pass
1738
+22
130.72
Llanwern West Jn
pass
1719
pass
1741¾
+22
131.63
East Usk Jn.
pass
1719½
pass
1742¼
+22
132.55
Maindee East Jn
pass
1720½
pass
1743
+22
ML
132.77
Maindee West Jn
pass
1721
pass
1743¾
+22
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1745
1746
+22
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1747¾
+22
DM
134.68
Ebbw Jn
pass
1726½
pass
1748¾
+22
DM
DM
138.41
Marshfield
1
pass
1729
pass
1751¼
+22
142.42
Rumney River Bridge Jn
pass
1732½
pass
1753¾
+21
143.01
Pengam Jn
pass
1733
pass
1754¼
+21
143.46
Moorland Road Junction
1
pass
1733½
pass
1754¾
+21
DM
DR
144.16
Long Dyke Jn
pass
1735
pass
1755½
+20
E
144.79
Cardiff East
pass
1736½
pass
1756½
+19
DR
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1757¾
1759½
+20
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1802½
+20
D
DM
149.14
St Fagans L C
pass
1744½
pass
1804¾
+20
154.08
Miskin
pass
1748½
pass
1808¾
+20
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1811
+20
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1814
+21
161.41
Pencoed [PCD]
1
pass
1754½
pass
1816
+21
164.42
Tremains
pass
1757
pass
1817¾
+21
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1819½
1820¾
+20
DM
DM
169.46
Stormy
½
pass
1804½
pass
1825½
+21
171.21
Pyle [PYL]
1
pass
1806
pass
1826¾
+21
173.45
Margam Moors Jn.
pass
1807½
pass
1827¾
+20
DM
175.12
Margam East Jn
pass
1808½
pass
1829¼
+20
176.00
Margam Middle Jn
pass
1809
pass
1829½
+20
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1831½
1832½
+20
179.38
Baglan [BAJ]
1
pass
1814½
pass
1835¼
+20
180.09
Briton Ferry East
pass
1815½
pass
1835¾
+20
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1836¾
+20
181.38
Court Sart Jn
pass
1816½
pass
1836¾
+20
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1838½
1840
+20
185.06
Skewen [SKE]
1
pass
1824
pass
1843
+19
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1845
+18
189.42
Landore Junction
pass
1831
pass
1847½
+16
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1849
+17
190.67
Swansea [SWA]
joins with 1L34 towards London Paddington and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
1851¼
+17
DSM
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