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1B21 1548 London Paddington to Swansea
Departing on 13th December 2025

operated by
Great Western Railway
10 coaches
802012
802013
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
9
1548
1548
1547¾
3
0.41
Royal Oak Junction
pass
1549
pass
1550¼
+1
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1551¾
+1
1.68
Ladbroke Grove
pass
1551
pass
1552½
+1
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1553¼
+1
3.15
Old Oak Common West
pass
1552
pass
1553¾
+1
3.48
Friars Jn
pass
1552½
pass
1554
+1
4.16
Acton Main Line [AML]
pass
1553
pass
1554½
+1
4.75
Acton West
pass
1553½
pass
1555
+1
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1555¼
+1
6.41
West Ealing [WEA]
pass
1554½
pass
1555¾
+1
6.49
West Ealing Junction
pass
1554½
pass
1555¾
+1
7.23
Hanwell [HAN]
pass
1554½
pass
1556¼
+1
8.57
Southall East Jn
pass
1555½
pass
1557
+1
9.01
Southall [STL]
1
pass
1555½
pass
1557½
+2
9.65
Southall West Jn
pass
1556
pass
1557¼
+1
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1558¼
+1
11.09
Heathrow Airport Jn
pass
1556½
pass
1558
+1
ML
12.04
Stockley Junction
pass
1557
pass
1558½
+1
12.62
West Drayton East
pass
1557½
pass
1558¾
+1
13.12
West Drayton [WDT]
1
pass
1557½
pass
1559¼
+1
13.26
West Drayton Jcn
pass
1557½
pass
1559½
+1
14.55
Iver [IVR]
1
pass
1558
pass
1600
+1
16.13
Langley [LNY]
1
pass
1559
pass
1601
+2
17.13
Dolphin Jn
pass
1559½
pass
1601¼
+1
18.31
Slough [SLO]
2
pass
1600
pass
1601¾
+1
ML
19.06
Slough West
pass
1600½
pass
1602
+1
20.72
Burnham [BNM]
pass
1601½
pass
1602¾
+1
22.34
Taplow [TAP]
1
pass
1602
pass
1603½
+1
23.53
Maidenhead East
pass
1602½
pass
1604¼
+1
24.14
Maidenhead [MAI]
1
pass
1603
pass
1604¾
+1
29.40
Ruscombe
pass
1606
pass
1607
+1
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1607¾
+1
ML
31.57
Twyford West
pass
1607
pass
1608
+1
35.10
Kennet Bridge Jn
pass
1609½
pass
1610½
+1
35.56
Reading Main Line East
pass
1610
pass
1611¼
+1
35.75
Reading [RDG]
9
1611
1613
1611
1613
1612¼
1613½
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1614¼
36.45
Reading High Level Jn
pass
1614
pass
1615¼
+1
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1616¼
+1
38.47
Tilehurst [TLH]
1
pass
1615
pass
1616½
+1
41.38
Pangbourne [PAN]
pass
1617
pass
1617¾
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1619¾
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1621¼
51.32
Moreton Cutting
pass
1623
pass
1622½
52.61
Didcot East Jn
pass
1624
pass
1623¼
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1623¾
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624
55.14
Milton Junction
pass
1625
pass
1624¼
56.27
Steventon
pass
1626
pass
1625
60.17
Wantage Road
pass
1628
pass
1627½
63.75
Challow
pass
1630
pass
1629½
66.34
Uffington (Oxfordshire)
1
pass
1631
pass
1630¾
72.25
Bourton
pass
1634½
pass
1633½
74.46
Swindon South Marston Jn
pass
1636
pass
1634¾
-1
75.58
Swindon Stratton Green
pass
1636½
pass
1635½
-1
76.27
Highworth Jn
pass
1637
pass
1635½
-1
76.59
Swindon East Loop
pass
1637
pass
1636¾
77.18
Swindon [SWI]
4
1638
1640
1638
1640
1637½
1639¾
DM
DM
82.67
Wootton Bassett Jn
pass
1644½
pass
1644¼
DM
DB
89.57
Little Somerford
pass
1648½
pass
1648¼
94.16
Hullavington
1
pass
1651
pass
1650¾
99.76
Badminton
pass
1654½
pass
1653
-1
104.40
Chipping Sodbury
pass
1657
pass
1656
107.09
Westerleigh Jn
pass
1658½
pass
1657½
111.57
Bristol Parkway [BPW]
½
2
1702
1704
1701½
1704
1701½
1704¼
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1706
116.45
Pilning [PIL]
2
pass
1708½
pass
1709
118.03
Severn Tunnel East
pass
1709½
pass
1710
122.31
Severn Tunnel West
pass
1713
pass
1713½
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1715
+1
DT
DM
125.66
Magor
pass
1715½
pass
1716½
+1
130.72
Llanwern West Jn
pass
1719
pass
1720½
+1
131.63
East Usk Jn.
pass
1720
pass
1721
+1
132.55
Maindee East Jn
pass
1720½
pass
1722¼
+1
132.77
Maindee West Jn
pass
1721
pass
1723
+2
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1724¼
1726¼
+2
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1727¾
+2
DM
134.68
Ebbw Jn
pass
1726½
pass
1728¾
+2
DM
DM
138.41
Marshfield
1
pass
1729
pass
1731½
+2
142.42
Rumney River Bridge Jn
pass
1732½
pass
1734
+1
143.01
Pengam Jn
pass
1733
pass
1734½
+1
143.46
Moorland Road Junction
pass
1733½
pass
1735
+1
144.16
Long Dyke Jn
pass
1734
pass
1736
+2
E
144.79
Cardiff East
pass
1735½
pass
1737
+1
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1736
1739
1736
1739
1738¾
1741¾
+2
E
D
145.37
Cardiff West
pass
1740
No report
146.36
Leckwith North Jn
pass
1742
pass
1744¾
+2
D
DM
149.14
St Fagans L C
pass
1744
pass
1747¼
+3
154.08
Miskin
pass
1748
pass
1751¼
+3
156.21
Pontyclun [PYC]
1
pass
1750
pass
1753
+3
156.57
Llantrisant [LTI]
pass
1750½
No report
158.53
Llanharan [LLR]
2
pass
1752
pass
1755¼
+3
161.41
Pencoed [PCD]
1
pass
1754
pass
1757¼
+3
164.42
Tremains
pass
1756½
pass
1759¾
+3
165.26
Bridgend [BGN]
1
1758
1759
1757½
1759
1802¼
1804¾
+5
DM
DM
169.46
Stormy
pass
1803½
pass
1809¾
+6
171.21
Pyle [PYL]
1
pass
1804½
pass
1811
+6
173.45
Margam Moors Jn.
pass
1806
pass
1812¼
+6
DM
175.12
Margam East Jn
pass
1807
pass
1813½
+6
176.00
Margam Middle Jn
pass
1807½
pass
1813¾
+6
176.70
Port Talbot East
pass
1808½
No report
177.39
Port Talbot Parkway [PTA]
1
1810
1811
1809½
1811
1815¾
1817¾
+6
179.38
Baglan [BAJ]
1
pass
1813
pass
1820½
+7
180.09
Briton Ferry East
pass
1814
pass
1821
+7
181.20
Briton Ferry [BNF]
1
pass
1815
pass
1822¼
+7
181.38
Court Sart Jn
pass
1815
pass
1822
+7
183.00
Neath [NTH]
1
1
1817
1818
1817
1818½
1823¾
1826
+7
185.06
Skewen [SKE]
1
pass
1821½
pass
1829½
+8
186.68
Llansamlet [LAS]
1
pass
1824
pass
1832¾
+9
189.42
Landore Junction
pass
1827
pass
1836½
+9
DM
DSM
190.23
Swansea Loop East
pass
1828
pass
1838
+10
190.67
Swansea [SWA]
3
1830
1830
1840¼
+10
DSM
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