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1B21 1546 London Paddington to Swansea
Departing on 27th December 2025

operated by
Great Western Railway
GBTT
WTT
RTTRealtime
Route
Mi.Ch
Location
Pl
Arr
Dep
Arr
Dep
Arr
Dep
Dly
Path
Line
0.00
London Paddington [PAD]
8
1546
1546
1546
4
0.41
Royal Oak Junction
pass
1547
pass
1547
4
1.28
Portobello Jn (London)
pass
1548
pass
1548
3
1.68
Ladbroke Grove
pass
1549
pass
1549
3
ML
2.55
Old Oak Common East
pass
1549½
pass
1549
3.15
Old Oak Common West
pass
1550
pass
1550
3.48
Friars Jn
pass
1550½
pass
1550
4.16
Acton Main Line [AML]
pass
1551
pass
1550
4.75
Acton West
pass
1551½
pass
1551
ML
ML
5.51
Ealing Broadway [EAL]
pass
1552
pass
1551
6.41
West Ealing [WEA]
pass
1552½
pass
1552
6.49
West Ealing Junction
pass
1552½
pass
1552
7.23
Hanwell [HAN]
pass
1552½
pass
1552
8.57
Southall East Jn
pass
1553½
pass
1553
9.01
Southall [STL]
1
1
pass
1553½
pass
1553
ML
9.65
Southall West Jn
pass
1554½
pass
1553
10.66
Hayes & Harlington [HAY]
pass
1555
pass
1554
11.09
Heathrow Airport Jn
pass
1555½
pass
1555
ML
12.04
Stockley Junction
pass
1556
pass
1555
12.62
West Drayton East
pass
1556½
pass
1555
13.12
West Drayton [WDT]
pass
1556½
pass
1556
13.26
West Drayton Jcn
pass
1556½
pass
1556
14.55
Iver [IVR]
pass
1557
pass
1556
16.13
Langley [LNY]
pass
1558
pass
1557
17.13
Dolphin Jn
pass
1558½
pass
1558
18.31
Slough [SLO]
2
pass
1559
pass
1558
ML
19.06
Slough West
pass
1559½
pass
1558
20.72
Burnham [BNM]
pass
1600½
pass
1559
22.34
Taplow [TAP]
pass
1601
pass
1600
23.53
Maidenhead East
pass
1601½
pass
1601
24.14
Maidenhead [MAI]
1
pass
1602
pass
1601
ML
29.40
Ruscombe
pass
1605
pass
1604
30.76
Twyford [TWY]
1
1
pass
1605½
pass
1605
ML
31.57
Twyford West
pass
1606
pass
1605
35.10
Kennet Bridge Jn
pass
1608½
pass
1608
DML
35.56
Reading Main Line East
pass
1609
pass
1608
35.75
Reading [RDG]
9
1610
1613
1610
1613
1609
1613
ML
36.12
Reading Main Line West
pass
1613½
pass
1613
36.45
Reading High Level Jn
pass
1614
pass
1614
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1615
38.47
Tilehurst [TLH]
pass
1615
pass
1615
41.38
Pangbourne [PAN]
pass
1617
pass
1617
44.55
Goring & Streatley [GOR]
1
pass
1619
pass
1619
ML
48.32
Cholsey [CHO]
pass
1621
pass
1621
51.32
Moreton Cutting
pass
1623
pass
1622
52.61
Didcot East Jn
pass
1624
pass
1623
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1623
53.20
Didcot West End
pass
1624
pass
1623
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624
55.14
Milton Junction
pass
1625
pass
1625
56.27
Steventon
pass
1626
pass
1625
60.17
Wantage Road
pass
1628
pass
1627
63.75
Challow
pass
1630
pass
1629
66.34
Uffington (Oxfordshire)
1
pass
1631
pass
1630
72.25
Bourton
pass
1634½
pass
1634
74.46
Swindon South Marston Jn
pass
1636
pass
1635
75.58
Swindon Stratton Green
pass
1636½
pass
1636
76.27
Highworth Jn
pass
1637
pass
1636
76.59
Swindon East Loop
pass
1637
pass
1636
77.18
Swindon [SWI]
4
1638
1640
1638
1640
1637
1640
78.31
Rushey Platt
pass
1641½
pass
1641
82.67
Wootton Bassett Jn
pass
1644½
pass
1644
89.57
Little Somerford
pass
1648½
pass
1648
94.16
Hullavington
1
pass
1651
pass
1651
99.76
Badminton
pass
1654½
pass
1654
104.40
Chipping Sodbury
pass
1657
pass
1656
107.09
Westerleigh Jn
pass
1658½
pass
1658
111.57
Bristol Parkway [BPW]
½
2
1702
1704
1701½
1704
1701
1704
112.79
Patchway [PWY]
2
pass
1706
pass
1706
116.45
Pilning [PIL]
2
pass
1708½
pass
1708
118.03
Severn Tunnel East
pass
1709½
pass
1709
122.31
Severn Tunnel West
pass
1713
pass
1713
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1714
ML
125.66
Magor
pass
1715½
pass
1715
130.72
Llanwern West Jn
pass
1719
pass
1719
131.63
East Usk Jn.
pass
1719½
pass
1719
132.55
Maindee East Jn
pass
1720½
pass
1720
ML
132.77
Maindee West Jn
pass
1721
pass
1721
133.31
Newport (South Wales) [NWP]
Pathed as Class 80x on diesel from here
2
1722
1724
1722
1724
1722
1724
DM
134.13
Gaer Jn
pass
1725½
pass
1725
ML
134.68
Ebbw Jn
4
pass
1726½
pass
1726
138.41
Marshfield
1
pass
1733
pass
1732
142.42
Rumney River Bridge Jn
pass
1736½
pass
1735
143.01
Pengam Jn
pass
1737
pass
1736
143.46
Moorland Road Junction
pass
1737½
pass
1736
144.16
Long Dyke Jn
pass
1738
pass
1737
E
144.79
Cardiff East
pass
1739½
pass
1739
145.11
Cardiff Central [CDF]
4
1741
1746
1740½
1746
1739
1746
145.37
Cardiff West
pass
1747½
pass
1747
145.52
Cardiff Radyr Branch Jn
pass
1748
pass
1748
145.74
Penarth Curve North Jn
2
pass
1749
pass
1749
146.10
Ninian Park [NNP]
1
pass
1752
pass
1752
146.16
Leckwith South Jn
pass
1752
pass
1752
146.29
Leckwith Loop
pass
1752½
pass
1752
146.42
Leckwith North Jn
pass
1753
pass
1753
149.20
St Fagans L C
pass
1755½
pass
1755
154.14
Miskin
pass
1759½
pass
1759
156.27
Pontyclun [PYC]
pass
1801½
pass
1801
156.63
Llantrisant [LTI]
pass
1802
pass
1801
158.59
Llanharan [LLR]
pass
1803½
pass
1803
161.47
Pencoed [PCD]
pass
1805½
pass
1805
164.48
Tremains
pass
1808
pass
1807
165.32
Bridgend [BGN]
1
1809
1810
1809
1810½
1809
1810
169.52
Stormy
pass
1815
pass
1814
171.27
Pyle [PYL]
pass
1816
pass
1815
173.51
Margam Moors Jn.
pass
1817½
pass
1817
175.18
Margam East Jn
pass
1818½
pass
1818
176.06
Margam Middle Jn
pass
1819
pass
1818
176.76
Port Talbot East
pass
1820
pass
1819
177.45
Port Talbot Parkway [PTA]
1
1821
1822
1821
1822½
1820
1822
179.44
Baglan [BAJ]
pass
1824½
pass
1824
180.15
Briton Ferry East
pass
1825½
pass
1824
181.26
Briton Ferry [BNF]
pass
1826½
pass
1825
181.44
Court Sart Jn
pass
1826½
pass
1826
183.06
Neath [NTH]
1
1829
1830
1828½
1830
1828
1830
185.12
Skewen [SKE]
pass
1833
pass
1832
186.74
Llansamlet [LAS]
pass
1835½
pass
1835
189.48
Landore Junction
pass
1838½
pass
1838
190.29
Swansea Loop East
pass
1839½
pass
1839
190.73
Swansea [SWA]
3
1841
1841
1840
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