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1B21 1548 London Paddington to Swansea
Departing on 16th December 2025

operated by
Great Western Railway
5 coaches
800003
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
1605
+17
3
0.41
Royal Oak Junction
pass
1549
pass
1606½
+17
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1607½
+17
1.68
Ladbroke Grove
pass
1551
pass
1608¼
+17
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1609
+17
3.15
Old Oak Common West
pass
1552
pass
1609½
+17
3.48
Friars Jn
pass
1552½
pass
1609¾
+17
4.16
Acton Main Line [AML]
pass
1553
pass
1610¼
+17
4.75
Acton West
pass
1553½
pass
1610¾
+17
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1611¼
+17
6.41
West Ealing [WEA]
pass
1554½
pass
1611¾
+17
6.49
West Ealing Junction
pass
1554½
pass
1611¾
+17
7.23
Hanwell [HAN]
pass
1554½
pass
1612
+17
8.57
Southall East Jn
pass
1555½
pass
1612¾
+17
9.01
Southall [STL]
1
pass
1555½
pass
1613¼
+17
9.65
Southall West Jn
pass
1556
pass
1613¼
+17
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1614
+17
11.09
Heathrow Airport Jn
pass
1556½
pass
1614
+17
ML
12.04
Stockley Junction
pass
1557
pass
1614¼
+17
12.62
West Drayton East
pass
1557½
pass
1614¾
+17
13.12
West Drayton [WDT]
1
pass
1557½
pass
1615¼
+17
13.26
West Drayton Jcn
pass
1557½
pass
1615¼
+17
14.55
Iver [IVR]
1
pass
1558
pass
1615¾
+17
16.13
Langley [LNY]
1
pass
1559
pass
1616¾
+18
17.13
Dolphin Jn
pass
1559½
pass
1617
+17
18.31
Slough [SLO]
2
pass
1600
pass
1617¾
+17
ML
19.06
Slough West
pass
1600½
pass
1618
+17
20.72
Burnham [BNM]
pass
1601½
pass
1618¾
+17
22.34
Taplow [TAP]
1
pass
1602
pass
1619½
+17
23.53
Maidenhead East
pass
1602½
pass
1620¼
+17
24.14
Maidenhead [MAI]
1
pass
1603
pass
1620¾
+17
29.40
Ruscombe
pass
1606
pass
1623
+17
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1623¾
+17
ML
31.57
Twyford West
pass
1607
pass
1624
+17
35.10
Kennet Bridge Jn
pass
1609½
pass
1628
+18
35.56
Reading Main Line East
pass
1610
pass
1628¾
+18
35.75
Reading [RDG]
9
1611
1613
1611
1613
1629¾
1632½
+19
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1633¼
+19
36.45
Reading High Level Jn
pass
1614
pass
1634¼
+20
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1636
+21
38.47
Tilehurst [TLH]
1
pass
1615
pass
1636¼
+21
41.38
Pangbourne [PAN]
pass
1617
pass
1638¼
+21
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1640¼
+21
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1642
+20
51.32
Moreton Cutting
pass
1623
pass
1645½
+22
52.61
Didcot East Jn
pass
1624
pass
1646½
+22
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1647¼
+23
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1647½
+23
55.14
Milton Junction
pass
1625
pass
1648
+22
56.27
Steventon
pass
1626
pass
1648¾
+23
60.17
Wantage Road
pass
1628
pass
1651½
+23
63.75
Challow
pass
1630
pass
1653½
+23
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1654¾
+23
72.25
Bourton
pass
1635
pass
1657½
+22
74.46
Swindon South Marston Jn
pass
1636½
pass
1658¾
+22
75.58
Swindon Stratton Green
pass
1637
pass
1659¾
+22
76.27
Highworth Jn
pass
1637½
pass
1659¾
+22
76.59
Swindon East Loop
pass
1637½
pass
1701
+23
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1701¾
1703
+22
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1708
+23
DM
DB
89.57
Little Somerford
pass
1649
pass
1712½
+23
94.16
Hullavington
1
pass
1651½
pass
1715
+23
99.76
Badminton
pass
1655
pass
1717¼
+22
104.40
Chipping Sodbury
pass
1657½
pass
1720½
+23
107.09
Westerleigh Jn
½
pass
1659
pass
1722¼
+23
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1726½
1729½
+25
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1731
+25
116.45
Pilning [PIL]
2
pass
1708½
pass
1734
+25
118.03
Severn Tunnel East
pass
1709½
pass
1734¾
+25
122.31
Severn Tunnel West
pass
1713
pass
1738
+25
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1739½
+25
DT
DM
125.66
Magor
pass
1715½
pass
1741
+25
130.72
Llanwern West Jn
pass
1719
pass
1744½
+25
131.63
East Usk Jn.
pass
1719½
pass
1745¼
+25
132.55
Maindee East Jn
pass
1720½
pass
1746
+25
ML
132.77
Maindee West Jn
pass
1721
pass
1746¾
+25
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1748
1749½
+25
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1751¼
+25
DM
134.68
Ebbw Jn
pass
1726½
pass
1752
+25
DM
DM
138.41
Marshfield
1
pass
1729
pass
1755
+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
1759
+25
RL
144.16
Long Dyke Jn
pass
1735
pass
1759¾
+24
E
144.79
Cardiff East
pass
1736½
pass
1800¾
+24
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1802¼
1805½
+26
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1808¼
+25
D
DM
149.14
St Fagans L C
pass
1744½
pass
1810¾
+26
154.08
Miskin
pass
1748½
pass
1817
+28
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1818¾
+28
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1821
+28
161.41
Pencoed [PCD]
1
pass
1754½
pass
1825¾
+31
164.42
Tremains
pass
1757
pass
1828¾
+32
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1830½
1832
+32
DM
DM
169.46
Stormy
½
pass
1804½
pass
1837½
+33
171.21
Pyle [PYL]
1
pass
1806
pass
1839¾
+34
173.45
Margam Moors Jn.
pass
1807½
pass
1843¼
+35
DM
175.12
Margam East Jn
pass
1808½
pass
1845
+36
176.00
Margam Middle Jn
pass
1809
pass
1845½
+36
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1847¾
1849
+36
179.38
Baglan [BAJ]
1
pass
1814½
pass
1852
+37
180.09
Briton Ferry East
pass
1815½
pass
1852¼
+37
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1853½
+37
181.38
Court Sart Jn
pass
1816½
pass
1853½
+37
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1855¼
1856½
+36
185.06
Skewen [SKE]
1
pass
1824
pass
1859¾
+36
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1901¾
+35
189.42
Landore Junction
pass
1831
pass
1904¾
+34
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1906¼
+34
190.67
Swansea [SWA]
forms 5B21 to Swansea Maliphant Iep Dpt and joins with 1L34 towards London Paddington
3
1834
1834
1908¾
+34
DSM
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