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1B21 1548 London Paddington to Swansea
Departing on 6th January 2026

operated by
Great Western Railway
10 coaches
800021
800025
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
1550
+2
3
0.41
Royal Oak Junction
pass
1549
pass
1551¼
+2
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1552½
+2
1.68
Ladbroke Grove
pass
1551
pass
1553¼
+2
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1554¼
+2
3.15
Old Oak Common West
pass
1552
pass
1554¾
+2
3.48
Friars Jn
pass
1552½
pass
1555
+2
4.16
Acton Main Line [AML]
pass
1553
pass
1555½
+2
4.75
Acton West
pass
1553½
pass
1556½
+3
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1557¾
+3
6.41
West Ealing [WEA]
pass
1554½
pass
1559½
+5
6.49
West Ealing Junction
pass
1554½
pass
1559½
+5
7.23
Hanwell [HAN]
pass
1554½
pass
1600¼
+5
8.57
Southall East Jn
pass
1555½
pass
1601½
+6
9.01
Southall [STL]
1
pass
1555½
pass
1602
+6
9.65
Southall West Jn
pass
1556
pass
1602
+6
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1602¾
+6
11.09
Heathrow Airport Jn
pass
1556½
pass
1602¾
+6
ML
12.04
Stockley Junction
pass
1557
pass
1603
+6
12.62
West Drayton East
pass
1557½
pass
1603½
+6
13.12
West Drayton [WDT]
1
pass
1557½
pass
1604
+6
13.26
West Drayton Jcn
pass
1557½
pass
1604
+6
14.55
Iver [IVR]
1
pass
1558
pass
1604½
+6
16.13
Langley [LNY]
1
pass
1559
pass
1605½
+6
17.13
Dolphin Jn
pass
1559½
pass
1606
+6
18.31
Slough [SLO]
2
pass
1600
pass
1606¾
+6
ML
19.06
Slough West
pass
1600½
pass
1607¼
+6
20.72
Burnham [BNM]
pass
1601½
pass
1608¼
+7
22.34
Taplow [TAP]
1
pass
1602
pass
1609
+7
23.53
Maidenhead East
pass
1602½
pass
1609¾
+7
24.14
Maidenhead [MAI]
1
pass
1603
pass
1610¼
+7
29.40
Ruscombe
pass
1606
pass
1612½
+6
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1613¼
+6
ML
31.57
Twyford West
pass
1607
pass
1613½
+6
35.10
Kennet Bridge Jn
pass
1609½
pass
1616¼
+6
35.56
Reading Main Line East
pass
1610
pass
1616¾
+6
35.75
Reading [RDG]
9
1611
1613
1611
1613
1617¾
1619¾
+6
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1620½
+6
36.45
Reading High Level Jn
pass
1614
pass
1621½
+7
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1622¾
+7
38.47
Tilehurst [TLH]
1
pass
1615
pass
1623
+7
41.38
Pangbourne [PAN]
pass
1617
pass
1625
+8
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1627¼
+8
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1629¼
+8
51.32
Moreton Cutting
pass
1623
pass
1630¾
+7
52.61
Didcot East Jn
pass
1624
pass
1631½
+7
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1632¼
+8
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1632¾
+8
55.14
Milton Junction
pass
1625
pass
1633¾
+8
56.27
Steventon
pass
1626
pass
1635
+9
60.17
Wantage Road
pass
1628
pass
1639¾
+11
63.75
Challow
pass
1630
pass
1642¾
+12
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1643¾
+12
72.25
Bourton
pass
1635
pass
1646¾
+12
74.46
Swindon South Marston Jn
pass
1636½
pass
1658½
+22
75.58
Swindon Stratton Green
pass
1637
pass
1700
+23
76.27
Highworth Jn
pass
1637½
pass
1700¾
+23
76.59
Swindon East Loop
pass
1637½
pass
1702
+24
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1702¾
1704½
+24
DM
DM
78.31
Rushey Platt
pass
1642
pass
1706
+24
82.67
Wootton Bassett Jn
pass
1645
pass
1709
+24
DM
DB
89.57
Little Somerford
pass
1649
pass
1713
+24
94.16
Hullavington
1
pass
1651½
pass
1715½
+24
99.76
Badminton
pass
1655
pass
1717¾
+23
104.40
Chipping Sodbury
pass
1657½
pass
1720¾
+23
107.09
Westerleigh Jn
½
pass
1659
pass
1722½
+23
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1726½
1728¼
+23
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1729¾
+23
116.45
Pilning [PIL]
2
pass
1708½
pass
1733
+24
118.03
Severn Tunnel East
pass
1709½
pass
1734
+24
122.31
Severn Tunnel West
pass
1713
pass
1737¼
+24
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1738¾
+24
DT
DM
125.66
Magor
pass
1715½
pass
1740¼
+24
130.72
Llanwern West Jn
pass
1719
pass
1744¼
+25
131.63
East Usk Jn.
pass
1719½
pass
1745
+25
132.55
Maindee East Jn
pass
1720½
pass
1746
+25
ML
132.77
Maindee West Jn
pass
1721
pass
1747
+26
133.31
Newport (South Wales) [NWP]
3
1722
1724
1722
1724
1748¼
1750
+26
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1751¾
+26
DM
134.68
Ebbw Jn
pass
1726½
pass
1752¾
+26
DM
DM
138.41
Marshfield
1
pass
1729
pass
1755½
+26
142.42
Rumney River Bridge Jn
pass
1732½
pass
1758
+25
143.01
Pengam Jn
pass
1733
pass
1758½
+25
143.46
Moorland Road Junction
1
pass
1733½
pass
1759¼
+25
DM
DR
144.16
Long Dyke Jn
pass
1735
pass
1800
+25
E
144.79
Cardiff East
pass
1736½
pass
1801
+24
DR
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1802½
1804
+24
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1807
+24
D
DM
149.14
St Fagans L C
pass
1744½
pass
1809½
+24
154.08
Miskin
pass
1748½
pass
1813½
+24
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1815½
+25
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1817¾
+25
161.41
Pencoed [PCD]
1
pass
1754½
pass
1819¾
+25
164.42
Tremains
pass
1757
pass
1822
+25
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1823½
1825
+25
DM
DM
169.46
Stormy
½
pass
1804½
pass
1829¾
+25
171.21
Pyle [PYL]
1
pass
1806
pass
1832¼
+26
173.45
Margam Moors Jn.
pass
1807½
pass
1833¾
+26
DM
175.12
Margam East Jn
pass
1808½
pass
1835
+26
176.00
Margam Middle Jn
pass
1809
pass
1835¼
+26
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1838½
1839½
+27
179.38
Baglan [BAJ]
1
pass
1814½
pass
1844¼
+29
180.09
Briton Ferry East
pass
1815½
pass
1845¾
+30
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1847¼
+31
181.38
Court Sart Jn
pass
1816½
pass
1847¼
+30
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1850½
1851¾
+31
185.06
Skewen [SKE]
1
pass
1824
pass
1857½
+33
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1900¼
+33
189.42
Landore Junction
pass
1831
pass
1903¼
+32
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1904¾
+32
190.67
Swansea [SWA]
joins with 1L34 towards London Paddington and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
1907
+33
DSM
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