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1B21 1548 London Paddington to Swansea
Departing on 9th December 2025

operated by
Great Western Railway
10 coaches
800026
800016
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
1549
+1
3
0.41
Royal Oak Junction
pass
1549
pass
1550¼
+1
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1551½
+1
1.68
Ladbroke Grove
pass
1551
pass
1552¼
+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
1553¾
+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
1556
+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
1557½
+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
+2
13.26
West Drayton Jcn
pass
1557½
pass
1559½
+2
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
1604½
+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
1608¼
+1
35.10
Kennet Bridge Jn
pass
1609½
pass
1610¾
+1
35.56
Reading Main Line East
pass
1610
pass
1611½
+1
35.75
Reading [RDG]
9
1611
1613
1611
1613
1612¾
1614½
+1
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1615¼
+1
36.45
Reading High Level Jn
pass
1614
pass
1616
+2
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1617
+2
38.47
Tilehurst [TLH]
1
pass
1615
pass
1617¼
+2
41.38
Pangbourne [PAN]
pass
1617
pass
1618½
+1
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1620¼
+1
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1622
51.32
Moreton Cutting
pass
1623
pass
1623¼
52.61
Didcot East Jn
pass
1624
pass
1624
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1624½
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624¾
55.14
Milton Junction
pass
1625
pass
1625¼
56.27
Steventon
pass
1626
pass
1626
60.17
Wantage Road
pass
1628
pass
1628½
63.75
Challow
pass
1630
pass
1630½
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1631¾
72.25
Bourton
pass
1635
pass
1634½
74.46
Swindon South Marston Jn
pass
1636½
pass
1635¾
75.58
Swindon Stratton Green
pass
1637
pass
1636½
76.27
Highworth Jn
pass
1637½
pass
1636¾
76.59
Swindon East Loop
pass
1637½
pass
1638
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1639
1640¾
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1645½
DM
DB
89.57
Little Somerford
pass
1649
pass
1649½
94.16
Hullavington
1
pass
1651½
pass
1652
99.76
Badminton
pass
1655
pass
1654½
104.40
Chipping Sodbury
pass
1657½
pass
1657¼
107.09
Westerleigh Jn
½
pass
1659
pass
1659
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1703¼
1705¼
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1707
+1
116.45
Pilning [PIL]
2
pass
1708½
pass
1709¾
+1
118.03
Severn Tunnel East
pass
1709½
pass
1710¾
+1
122.31
Severn Tunnel West
pass
1713
pass
1713¾
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1715¼
+1
DT
DM
125.66
Magor
pass
1715½
pass
1716¾
+1
130.72
Llanwern West Jn
pass
1719
pass
1720¼
+1
131.63
East Usk Jn.
pass
1720
pass
1721
+1
132.55
Maindee East Jn
pass
1720½
pass
1721¾
+1
132.77
Maindee West Jn
pass
1721
pass
1722½
+1
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1723¾
1725¼
+1
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1727
+1
DM
134.68
Ebbw Jn
pass
1726½
pass
1728
+1
DM
DM
138.41
Marshfield
1 1
pass
1729
pass
1730½
+1
142.42
Rumney River Bridge Jn
pass
1733
pass
1732¾
143.01
Pengam Jn
pass
1733½
pass
1733¼
143.46
Moorland Road Junction
pass
1734½
pass
1733¾
144.16
Long Dyke Jn
pass
1735
pass
1734¾
E
144.79
Cardiff East
pass
1736½
pass
1735¾
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1736
1739
1737
1739
1737¼
1740¼
+1
E
D
145.37
Cardiff West
pass
1740
No report
146.36
Leckwith North Jn
pass
1742
pass
1743¼
+1
D
DM
149.14
St Fagans L C
pass
1744
pass
1746½
+2
154.08
Miskin
pass
1748
pass
1750½
+2
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
1756¾
+5
161.41
Pencoed [PCD]
1
pass
1754
pass
1758¾
+4
164.42
Tremains
pass
1756½
pass
1800¾
+4
165.26
Bridgend [BGN]
1
1758
1800
1757½
1800
1802½
1804½
+4
DM
DM
169.46
Stormy
½
pass
1804½
pass
1810
+5
171.21
Pyle [PYL]
1
pass
1806
pass
1811¼
+5
173.45
Margam Moors Jn.
pass
1807½
pass
1812½
+5
DM
175.12
Margam East Jn
pass
1808½
pass
1813¾
+5
176.00
Margam Middle Jn
pass
1809
pass
1814
+4
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1816¼
1817½
+5
179.38
Baglan [BAJ]
1
pass
1814½
pass
1820½
+5
180.09
Briton Ferry East
pass
1815½
pass
1821
+5
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1822¼
+6
181.38
Court Sart Jn
pass
1816½
pass
1822¼
+5
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1824
1825¾
+5
185.06
Skewen [SKE]
1
pass
1824
pass
1829
+5
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1831¼
+4
189.42
Landore Junction
pass
1831
pass
1834
+3
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1835½
+3
190.67
Swansea [SWA]
2
1834
1834
1838
+4
DSM
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