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1B21 1548 London Paddington to Swansea
Departing on 4th December 2025

operated by
Great Western Railway
9 coaches
800317
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
4
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
1552
3.15
Old Oak Common West
pass
1552
pass
1552½
3.48
Friars Jn
pass
1552½
pass
1552¾
4.16
Acton Main Line [AML]
pass
1553
pass
1553¼
4.75
Acton West
pass
1553½
pass
1553¾
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
1555
8.57
Southall East Jn
pass
1555½
pass
1555¾
9.01
Southall [STL]
1
pass
1555½
pass
1556¼
9.65
Southall West Jn
pass
1556
pass
1556¼
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1557
11.09
Heathrow Airport Jn
pass
1556½
pass
1556¾
ML
12.04
Stockley Junction
pass
1557
pass
1557¼
12.62
West Drayton East
pass
1557½
pass
1557¾
13.12
West Drayton [WDT]
1
pass
1557½
pass
1558
13.26
West Drayton Jcn
pass
1557½
pass
1558¼
14.55
Iver [IVR]
1
pass
1558
pass
1558¾
16.13
Langley [LNY]
1
pass
1559
pass
1559¾
17.13
Dolphin Jn
pass
1559½
pass
1600
18.31
Slough [SLO]
2
pass
1600
pass
1600½
ML
19.06
Slough West
pass
1600½
pass
1600¾
20.72
Burnham [BNM]
pass
1601½
pass
1601½
22.34
Taplow [TAP]
1
pass
1602
pass
1602¼
23.53
Maidenhead East
pass
1602½
pass
1603¼
24.14
Maidenhead [MAI]
1
pass
1603
pass
1603½
29.40
Ruscombe
pass
1606
pass
1605¾
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1606½
ML
31.57
Twyford West
pass
1607
pass
1606¾
35.10
Kennet Bridge Jn
pass
1609½
pass
1609¼
35.56
Reading Main Line East
pass
1610
pass
1609¾
35.75
Reading [RDG]
9
1611
1613
1611
1613
1611
1612¾
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1613½
36.45
Reading High Level Jn
pass
1614
pass
1614½
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1615½
38.47
Tilehurst [TLH]
1
pass
1615
pass
1615¾
41.38
Pangbourne [PAN]
pass
1617
pass
1617
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1618¾
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1620½
51.32
Moreton Cutting
pass
1623
pass
1621¾
-1
52.61
Didcot East Jn
pass
1624
pass
1622¼
-1
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1622¾
-1
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1623
-1
55.14
Milton Junction
pass
1625
pass
1623½
-1
56.27
Steventon
pass
1626
pass
1624¼
-1
60.17
Wantage Road
pass
1628
pass
1626¾
-1
63.75
Challow
pass
1630
pass
1628¾
-1
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1630
72.25
Bourton
pass
1635
pass
1632¾
-1
74.46
Swindon South Marston Jn
pass
1636½
pass
1634
-2
75.58
Swindon Stratton Green
pass
1637
pass
1634¾
-2
76.27
Highworth Jn
pass
1637½
pass
1635
-2
76.59
Swindon East Loop
pass
1637½
pass
1636
-1
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1637
1639¾
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1644½
DM
DB
89.57
Little Somerford
pass
1649
pass
1648½
94.16
Hullavington
1
pass
1651½
pass
1651
99.76
Badminton
pass
1655
pass
1653½
-1
104.40
Chipping Sodbury
pass
1657½
pass
1656¼
-1
107.09
Westerleigh Jn
½
pass
1659
pass
1658
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1704
1706¼
+1
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1707¾
+1
116.45
Pilning [PIL]
2
pass
1708½
pass
1710¾
+2
118.03
Severn Tunnel East
pass
1709½
pass
1711¾
+2
122.31
Severn Tunnel West
pass
1713
pass
1715¼
+2
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1716¾
+2
DT
DM
125.66
Magor
pass
1715½
pass
1718¼
+2
130.72
Llanwern West Jn
pass
1719
pass
1721¾
+2
131.63
East Usk Jn.
pass
1720
pass
1722½
+2
132.55
Maindee East Jn
pass
1720½
pass
1723¼
+2
132.77
Maindee West Jn
pass
1721
pass
1724¼
+3
DM
DR
133.31
Newport (South Wales) [NWP]
1
1722
1724
1722
1724
1725¾
1727¾
+3
DR
DR
134.13
Gaer Jn
pass
1725½
pass
1729¾
+4
DR
DM
134.68
Ebbw Jn
pass
1726½
pass
1730¾
+4
DM
DM
138.41
Marshfield
1 1
pass
1729
pass
1733¾
+4
142.42
Rumney River Bridge Jn
pass
1733
pass
1736
+2
143.01
Pengam Jn
pass
1733½
pass
1736½
+2
143.46
Moorland Road Junction
pass
1734½
pass
1737
+2
144.16
Long Dyke Jn
pass
1735
pass
1738
+3
E
144.79
Cardiff East
pass
1736½
pass
1739¼
+3
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1736
1739
1737
1739
1740¾
1743¼
+4
E
D
145.37
Cardiff West
pass
1740
No report
146.36
Leckwith North Jn
pass
1742
pass
1746¼
+4
D
DM
149.14
St Fagans L C
pass
1744
pass
1748¾
+4
154.08
Miskin
pass
1748
pass
1752¾
+4
156.21
Pontyclun [PYC]
1
pass
1750
pass
1754¾
+4
156.57
Llantrisant [LTI]
pass
1750½
No report
158.53
Llanharan [LLR]
2
pass
1752
pass
1757
+5
161.41
Pencoed [PCD]
1
pass
1754
pass
1759
+5
164.42
Tremains
pass
1756½
pass
1801¼
+4
165.26
Bridgend [BGN]
1
1758
1800
1757½
1800
1803
1804¾
+4
DM
DM
169.46
Stormy
½
pass
1804½
pass
1810½
+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
1817
1818½
+6
179.38
Baglan [BAJ]
1
pass
1814½
pass
1821½
+7
180.09
Briton Ferry East
pass
1815½
pass
1822
+6
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1823¼
+7
181.38
Court Sart Jn
pass
1816½
pass
1823¼
+6
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1825½
1827
+7
185.06
Skewen [SKE]
1
pass
1824
pass
1830½
+6
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1832¾
+6
189.42
Landore Junction
pass
1831
pass
1835¾
+4
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1837¼
+5
190.67
Swansea [SWA]
2
1834
1834
1839½
+5
DSM
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