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1B21 1548 London Paddington to Swansea
Departing on 17th December 2025

operated by
Great Western Railway
10 coaches
800004
800007
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
8
1548
1548
1551
+3
3
0.41
Royal Oak Junction
pass
1549
pass
1552½
+3
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1553¾
+3
1.68
Ladbroke Grove
pass
1551
pass
1554¼
+3
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1555¼
+3
3.15
Old Oak Common West
pass
1552
pass
1555¾
+3
3.48
Friars Jn
pass
1552½
pass
1556
+3
4.16
Acton Main Line [AML]
pass
1553
pass
1556½
+3
4.75
Acton West
pass
1553½
pass
1557
+3
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1557½
+3
6.41
West Ealing [WEA]
pass
1554½
pass
1558
+3
6.49
West Ealing Junction
pass
1554½
pass
1558
+3
7.23
Hanwell [HAN]
pass
1554½
pass
1558¼
+3
8.57
Southall East Jn
pass
1555½
pass
1559
+3
9.01
Southall [STL]
1
pass
1555½
pass
1559½
+4
9.65
Southall West Jn
pass
1556
pass
1559½
+3
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1600¼
+4
11.09
Heathrow Airport Jn
pass
1556½
pass
1600
+3
ML
12.04
Stockley Junction
pass
1557
pass
1600½
+3
12.62
West Drayton East
pass
1557½
pass
1601
+3
13.12
West Drayton [WDT]
1
pass
1557½
pass
1601½
+4
13.26
West Drayton Jcn
pass
1557½
pass
1601½
+4
14.55
Iver [IVR]
1
pass
1558
pass
1602
+3
16.13
Langley [LNY]
1
pass
1559
pass
1603
+4
17.13
Dolphin Jn
pass
1559½
pass
1603¼
+4
18.31
Slough [SLO]
2
pass
1600
pass
1603¾
+3
ML
19.06
Slough West
pass
1600½
pass
1604¼
+3
20.72
Burnham [BNM]
pass
1601½
pass
1605
+3
22.34
Taplow [TAP]
1
pass
1602
pass
1605¾
+3
23.53
Maidenhead East
pass
1602½
pass
1606½
+3
24.14
Maidenhead [MAI]
1
pass
1603
pass
1607
+4
29.40
Ruscombe
pass
1606
pass
1609
+3
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1609¾
+3
ML
31.57
Twyford West
pass
1607
pass
1610¼
+3
35.10
Kennet Bridge Jn
pass
1609½
pass
1612½
+3
35.56
Reading Main Line East
pass
1610
pass
1613
+2
35.75
Reading [RDG]
9
1611
1613
1611
1613
1614¼
1616
+3
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1616¾
+3
36.45
Reading High Level Jn
pass
1614
pass
1617½
+3
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1618½
+3
38.47
Tilehurst [TLH]
1
pass
1615
pass
1618¾
+3
41.38
Pangbourne [PAN]
pass
1617
pass
1620
+3
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1621¾
+2
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1623½
+2
51.32
Moreton Cutting
pass
1623
pass
1624¾
+1
52.61
Didcot East Jn
pass
1624
pass
1625¼
+1
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1625¾
+1
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1626
+1
55.14
Milton Junction
pass
1625
pass
1626½
+1
56.27
Steventon
pass
1626
pass
1627¼
+1
60.17
Wantage Road
pass
1628
pass
1630
+2
63.75
Challow
pass
1630
pass
1632¼
+2
DM
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1633¼
+2
72.25
Bourton
pass
1635
pass
1636¼
+1
74.46
Swindon South Marston Jn
pass
1636½
pass
1637¼
+1
75.58
Swindon Stratton Green
pass
1637
pass
1638
+1
76.27
Highworth Jn
pass
1637½
pass
1638¼
76.59
Swindon East Loop
pass
1637½
pass
1639½
+1
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1640¼
1642½
+2
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1647¼
+2
DM
DB
89.57
Little Somerford
pass
1649
pass
1652
+3
94.16
Hullavington
1
pass
1651½
pass
1654¼
+2
99.76
Badminton
pass
1655
pass
1656¾
+2
104.40
Chipping Sodbury
pass
1657½
pass
1659¾
+2
107.09
Westerleigh Jn
½
pass
1659
pass
1701½
+2
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1705¾
1710½
+6
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1711¾
+5
116.45
Pilning [PIL]
2
pass
1708½
pass
1714¾
+6
118.03
Severn Tunnel East
pass
1709½
pass
1715½
+6
122.31
Severn Tunnel West
pass
1713
pass
1719
+6
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1720¼
+6
DT
DM
125.66
Magor
pass
1715½
pass
1721¾
+6
130.72
Llanwern West Jn
pass
1719
pass
1725½
+6
131.63
East Usk Jn.
pass
1719½
pass
1726¼
+6
132.55
Maindee East Jn
pass
1720½
pass
1727¼
+6
ML
132.77
Maindee West Jn
pass
1721
pass
1728¼
+7
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1729½
1731
+7
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1732½
+7
DM
134.68
Ebbw Jn
pass
1726½
pass
1733½
+7
DM
DM
138.41
Marshfield
1
pass
1729
pass
1736¼
+7
142.42
Rumney River Bridge Jn
pass
1732½
pass
1738½
+6
143.01
Pengam Jn
pass
1733
pass
1739
+6
143.46
Moorland Road Junction
1
pass
1733½
pass
1739½
+6
RL
144.16
Long Dyke Jn
pass
1735
pass
1740½
+5
E
144.79
Cardiff East
pass
1736½
pass
1741¾
+5
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1743¼
1746
+6
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1748¾
+6
D
DM
149.14
St Fagans L C
pass
1744½
pass
1751¼
+6
154.08
Miskin
pass
1748½
pass
1755¼
+6
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1757¼
+6
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1759¼
+7
161.41
Pencoed [PCD]
1
pass
1754½
pass
1801¼
+6
164.42
Tremains
pass
1757
pass
1803¼
+6
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1805
1806½
+6
DM
DM
169.46
Stormy
½
pass
1804½
pass
1811½
+7
171.21
Pyle [PYL]
1
pass
1806
pass
1812½
+6
173.45
Margam Moors Jn.
pass
1807½
pass
1813¾
+6
DM
175.12
Margam East Jn
pass
1808½
pass
1815¼
+6
176.00
Margam Middle Jn
pass
1809
pass
1815¼
+6
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1817½
1819¾
+7
179.38
Baglan [BAJ]
1
pass
1814½
pass
1822½
+7
180.09
Briton Ferry East
pass
1815½
pass
1822¾
+7
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1824
+7
181.38
Court Sart Jn
pass
1816½
pass
1824
+7
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1825¾
1827¾
+7
185.06
Skewen [SKE]
1
pass
1824
pass
1830¾
+7
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1832¾
+6
189.42
Landore Junction
pass
1831
pass
1835½
+4
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1837
+5
190.67
Swansea [SWA]
joins with 1L34 towards London Paddington and forms 5B21 to Swansea Maliphant Iep Dpt
3
1834
1834
1841
+7
DSM
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