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1B21 1548 London Paddington to Swansea
Departing on 5th December 2025

operated by
Great Western Railway
10 coaches
800036
800023
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
1548¾
3
0.41
Royal Oak Junction
pass
1549
pass
1550
+1
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1551¼
1.68
Ladbroke Grove
pass
1551
pass
1551¾
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1552¾
+1
3.15
Old Oak Common West
pass
1552
pass
1553¼
+1
3.48
Friars Jn
pass
1552½
pass
1553½
+1
4.16
Acton Main Line [AML]
pass
1553
pass
1554
+1
4.75
Acton West
pass
1553½
pass
1554½
+1
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1554¾
+1
6.41
West Ealing [WEA]
pass
1554½
pass
1555¼
+1
6.49
West Ealing Junction
pass
1554½
pass
1555¼
+1
7.23
Hanwell [HAN]
pass
1554½
pass
1555½
+1
8.57
Southall East Jn
pass
1555½
pass
1556¼
+1
9.01
Southall [STL]
1
pass
1555½
pass
1556¾
+1
9.65
Southall West Jn
pass
1556
pass
1556¾
+1
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1557¾
+1
11.09
Heathrow Airport Jn
pass
1556½
pass
1557½
+1
ML
12.04
Stockley Junction
pass
1557
pass
1557¾
+1
12.62
West Drayton East
pass
1557½
pass
1558¼
+1
13.12
West Drayton [WDT]
1
pass
1557½
pass
1558¾
+1
13.26
West Drayton Jcn
pass
1557½
pass
1558¾
+1
14.55
Iver [IVR]
1
pass
1558
pass
1559¼
+1
16.13
Langley [LNY]
1
pass
1559
pass
1600½
+1
17.13
Dolphin Jn
pass
1559½
pass
1600¾
+1
18.31
Slough [SLO]
2
pass
1600
pass
1601¼
+1
ML
19.06
Slough West
pass
1600½
pass
1601½
+1
20.72
Burnham [BNM]
pass
1601½
pass
1602¼
+1
22.34
Taplow [TAP]
1
pass
1602
pass
1603
+1
23.53
Maidenhead East
pass
1602½
pass
1603¾
+1
24.14
Maidenhead [MAI]
1
pass
1603
pass
1604¼
+1
29.40
Ruscombe
pass
1606
pass
1606½
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1607¼
ML
31.57
Twyford West
pass
1607
pass
1607½
35.10
Kennet Bridge Jn
pass
1609½
pass
1609¾
35.56
Reading Main Line East
pass
1610
pass
1610½
35.75
Reading [RDG]
9
1611
1613
1611
1613
1611½
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
1617
+1
38.47
Tilehurst [TLH]
1
pass
1615
pass
1617
+1
41.38
Pangbourne [PAN]
pass
1617
pass
1618¼
+1
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1620¼
+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
1623¾
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1624¼
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1624½
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
1630¼
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1631¼
72.25
Bourton
pass
1635
pass
1634¼
74.46
Swindon South Marston Jn
pass
1636½
pass
1635¼
75.58
Swindon Stratton Green
pass
1637
pass
1636¼
76.27
Highworth Jn
pass
1637½
pass
1636¼
76.59
Swindon East Loop
pass
1637½
pass
1637½
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1638½
1640¼
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1645¼
DM
DB
89.57
Little Somerford
pass
1649
pass
1649½
94.16
Hullavington
1
pass
1651½
pass
1652
99.76
Badminton
pass
1655
pass
1654¼
104.40
Chipping Sodbury
pass
1657½
pass
1657¼
107.09
Westerleigh Jn
½
pass
1659
pass
1659½
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1705
1707¼
+2
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1709
+3
116.45
Pilning [PIL]
2
pass
1708½
pass
1712
+3
118.03
Severn Tunnel East
pass
1709½
pass
1712¾
+3
122.31
Severn Tunnel West
pass
1713
pass
1716¼
+3
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1718½
+4
DT
DM
125.66
Magor
pass
1715½
pass
1721¼
+5
130.72
Llanwern West Jn
pass
1719
pass
1726½
+7
131.63
East Usk Jn.
pass
1720
pass
1727
+7
132.55
Maindee East Jn
pass
1720½
pass
1728
+7
132.77
Maindee West Jn
pass
1721
pass
1728¾
+7
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1730
1731½
+7
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1733¼
+7
DM
134.68
Ebbw Jn
pass
1726½
pass
1734
+7
DM
DM
138.41
Marshfield
1 1
pass
1729
pass
1737
+8
142.42
Rumney River Bridge Jn
pass
1733
pass
1739¼
+6
143.01
Pengam Jn
pass
1733½
pass
1739¾
+6
143.46
Moorland Road Junction
pass
1734½
pass
1740¼
+6
144.16
Long Dyke Jn
pass
1735
pass
1742
+7
E
144.79
Cardiff East
pass
1736½
pass
1743¼
+7
DM
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1736
1739
1737
1739
1744¾
1747
+8
E
D
145.37
Cardiff West
pass
1740
No report
146.36
Leckwith North Jn
pass
1742
pass
1750
+8
D
DM
149.14
St Fagans L C
pass
1744
pass
1752½
+8
154.08
Miskin
pass
1748
pass
1756½
+8
156.21
Pontyclun [PYC]
1
pass
1750
pass
1758½
+8
156.57
Llantrisant [LTI]
pass
1750½
No report
158.53
Llanharan [LLR]
2
pass
1752
pass
1800½
+8
161.41
Pencoed [PCD]
1
pass
1754
pass
1802½
+8
164.42
Tremains
pass
1756½
pass
1804½
+8
165.26
Bridgend [BGN]
1
1758
1800
1757½
1800
1806
1808
+8
DM
DM
169.46
Stormy
½
pass
1804½
pass
1813¼
+8
171.21
Pyle [PYL]
1
pass
1806
pass
1815½
+9
173.45
Margam Moors Jn.
pass
1807½
pass
1818¾
+11
DM
175.12
Margam East Jn
pass
1808½
pass
1820¾
+12
176.00
Margam Middle Jn
pass
1809
pass
1821¼
+12
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1823½
1824¾
+12
179.38
Baglan [BAJ]
1
pass
1814½
pass
1827¾
+13
180.09
Briton Ferry East
pass
1815½
pass
1828
+12
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1829¼
+13
181.38
Court Sart Jn
pass
1816½
pass
1829¼
+12
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1831¼
1832¾
+12
185.06
Skewen [SKE]
1
pass
1824
pass
1836
+12
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1838
+11
189.42
Landore Junction
pass
1831
pass
1841
+10
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1842¼
+10
190.67
Swansea [SWA]
3
1834
1834
1844¼
+10
DSM
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