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1B21 1548 London Paddington to Swansea
Departing on 12th December 2025

operated by
Great Western Railway
10 coaches
800015
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
1547¾
4
0.41
Royal Oak Junction
pass
1549
pass
1549¼
4
4
1.28
Portobello Jn (London)
pass
1550½
pass
1550½
1.68
Ladbroke Grove
pass
1551
pass
1551¼
4
DR
2.55
Old Oak Common East
pass
1551½
pass
1552¼
3.15
Old Oak Common West
pass
1552
pass
1552¾
3.48
Friars Jn
pass
1552½
pass
1553
4.16
Acton Main Line [AML]
3
pass
1553
pass
1553½
4.75
Acton West
pass
1553½
pass
1554¼
DR
DM
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1554½
6.41
West Ealing [WEA]
pass
1554½
pass
1555½
+1
6.49
West Ealing Junction
pass
1554½
pass
1555½
+1
7.23
Hanwell [HAN]
pass
1554½
pass
1556
+1
8.57
Southall East Jn
pass
1555½
pass
1556¾
+1
9.01
Southall [STL]
1
pass
1555½
pass
1557¼
+1
9.65
Southall West Jn
pass
1556
pass
1557¼
+1
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1558
+1
11.09
Heathrow Airport Jn
pass
1556½
pass
1558
+1
ML
12.04
Stockley Junction
pass
1557
pass
1558¼
+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
1559¼
+1
14.55
Iver [IVR]
1
pass
1558
pass
1559¾
+1
16.13
Langley [LNY]
1
pass
1559
pass
1600¾
+2
17.13
Dolphin Jn
pass
1559½
pass
1601
+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
1610
35.56
Reading Main Line East
pass
1610
pass
1610¾
35.75
Reading [RDG]
9
1611
1613
1611
1613
1611¾
1614
+1
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1614¾
+1
36.45
Reading High Level Jn
pass
1614
pass
1615¾
+1
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1616¾
+1
38.47
Tilehurst [TLH]
1
pass
1615
pass
1616¾
+1
41.38
Pangbourne [PAN]
pass
1617
pass
1618¼
+1
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1620
+1
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1621¾
51.32
Moreton Cutting
pass
1623
pass
1623
52.61
Didcot East Jn
pass
1624
pass
1623½
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1624
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624¼
55.14
Milton Junction
pass
1625
pass
1624¾
56.27
Steventon
pass
1626
pass
1625½
60.17
Wantage Road
pass
1628
pass
1628
63.75
Challow
pass
1630
pass
1630
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1631
72.25
Bourton
pass
1635
pass
1634
74.46
Swindon South Marston Jn
pass
1636½
pass
1635
-1
75.58
Swindon Stratton Green
pass
1637
pass
1635¾
-1
76.27
Highworth Jn
pass
1637½
pass
1636
-1
76.59
Swindon East Loop
pass
1637½
pass
1637¼
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1638
1639¾
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1644¼
DM
DB
89.57
Little Somerford
pass
1649
pass
1648½
94.16
Hullavington
1
pass
1651½
pass
1651
99.76
Badminton
pass
1655
pass
1653¼
-1
104.40
Chipping Sodbury
pass
1657½
pass
1656
-1
107.09
Westerleigh Jn
½
pass
1659
pass
1657¾
-1
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1702
1704½
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
1709¾
122.31
Severn Tunnel West
pass
1713
pass
1713
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1714½
DT
DM
125.66
Magor
pass
1715½
pass
1716
130.72
Llanwern West Jn
pass
1719
pass
1719¾
131.63
East Usk Jn.
pass
1720
pass
1720¼
132.55
Maindee East Jn
pass
1720½
pass
1721
132.77
Maindee West Jn
pass
1721
pass
1722
+1
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1723
1724½
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1726¼
DM
134.68
Ebbw Jn
pass
1726½
pass
1727
DM
DM
138.41
Marshfield
1 1
pass
1729
pass
1729¾
142.42
Rumney River Bridge Jn
pass
1733
pass
1732
-1
143.01
Pengam Jn
pass
1733½
pass
1732½
-1
143.46
Moorland Road Junction
pass
1734½
pass
1733
-1
144.16
Long Dyke Jn
pass
1735
pass
1734½
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
1740
+1
E
E
145.37
Cardiff West
pass
1740
No report
146.36
Leckwith North Jn
pass
1742
pass
1744
+2
E
DM
149.14
St Fagans L C
pass
1744
pass
1747½
+3
154.08
Miskin
pass
1748
pass
1751½
+3
156.21
Pontyclun [PYC]
1
pass
1750
pass
1753½
+3
156.57
Llantrisant [LTI]
pass
1750½
No report
158.53
Llanharan [LLR]
2
pass
1752
pass
1755½
+3
161.41
Pencoed [PCD]
1
pass
1754
pass
1757½
+3
164.42
Tremains
pass
1756½
pass
1759½
+3
165.26
Bridgend [BGN]
1
1758
1800
1757½
1800
1801
1803¼
+3
DM
DM
169.46
Stormy
½
pass
1804½
pass
1808¾
+4
171.21
Pyle [PYL]
1
pass
1806
pass
1810
+4
173.45
Margam Moors Jn.
pass
1807½
pass
1811¼
+3
DM
175.12
Margam East Jn
pass
1808½
pass
1812½
+4
176.00
Margam Middle Jn
pass
1809
pass
1812¾
+3
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1814¾
1816¼
+3
179.38
Baglan [BAJ]
1
pass
1814½
pass
1819½
+4
180.09
Briton Ferry East
pass
1815½
pass
1819¾
+4
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1821
+4
181.38
Court Sart Jn
pass
1816½
pass
1821
+4
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1822¾
1824¼
+4
185.06
Skewen [SKE]
1
pass
1824
pass
1827½
+3
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1829¾
+3
189.42
Landore Junction
pass
1831
pass
1832½
+1
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1833¾
+1
190.67
Swansea [SWA]
2
1834
1834
1836¼
+2
DSM
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