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1B21 1548 London Paddington to Swansea
Departing on 15th December 2025

operated by
Great Western Railway
10 coaches
800024
800010
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
1548
3
0.41
Royal Oak Junction
pass
1549
pass
1549
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1550¼
1.68
Ladbroke Grove
pass
1551
pass
1550¾
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1551¾
3.15
Old Oak Common West
pass
1552
pass
1552¼
3.48
Friars Jn
pass
1552½
pass
1552½
4.16
Acton Main Line [AML]
pass
1553
pass
1553
4.75
Acton West
pass
1553½
pass
1553½
ML
ML
5.51
Ealing Broadway [EAL]
1
pass
1554
pass
1553¾
6.41
West Ealing [WEA]
pass
1554½
pass
1554¼
6.49
West Ealing Junction
pass
1554½
pass
1554¼
7.23
Hanwell [HAN]
pass
1554½
pass
1554½
8.57
Southall East Jn
pass
1555½
pass
1555¼
9.01
Southall [STL]
1
pass
1555½
pass
1555¾
9.65
Southall West Jn
pass
1556
pass
1556
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1556¾
11.09
Heathrow Airport Jn
pass
1556½
pass
1556½
ML
12.04
Stockley Junction
pass
1557
pass
1557
12.62
West Drayton East
pass
1557½
pass
1557½
13.12
West Drayton [WDT]
1
pass
1557½
pass
1558
13.26
West Drayton Jcn
pass
1557½
pass
1558
14.55
Iver [IVR]
1
pass
1558
pass
1558½
16.13
Langley [LNY]
1
pass
1559
pass
1559½
17.13
Dolphin Jn
pass
1559½
pass
1559¾
18.31
Slough [SLO]
2
pass
1600
pass
1600½
ML
19.06
Slough West
pass
1600½
pass
1600¾
20.72
Burnham [BNM]
pass
1601½
pass
1601½
22.34
Taplow [TAP]
1
pass
1602
pass
1602¼
23.53
Maidenhead East
pass
1602½
pass
1603
24.14
Maidenhead [MAI]
1
pass
1603
pass
1603½
29.40
Ruscombe
pass
1606
pass
1605½
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1606¼
ML
31.57
Twyford West
pass
1607
pass
1606¾
35.10
Kennet Bridge Jn
pass
1609½
pass
1609
35.56
Reading Main Line East
pass
1610
pass
1609¾
35.75
Reading [RDG]
9
1611
1613
1611
1613
1610¾
1613
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1613½
36.45
Reading High Level Jn
pass
1614
pass
1614½
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1615½
38.47
Tilehurst [TLH]
1
pass
1615
pass
1615½
41.38
Pangbourne [PAN]
pass
1617
pass
1616¾
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1618¾
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1620¼
51.32
Moreton Cutting
pass
1623
pass
1621½
-1
52.61
Didcot East Jn
pass
1624
pass
1622¼
-1
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1622¾
-1
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1623
-1
55.14
Milton Junction
pass
1625
pass
1623¼
-1
56.27
Steventon
pass
1626
pass
1624
-1
60.17
Wantage Road
pass
1628
pass
1626¾
-1
63.75
Challow
pass
1630
pass
1628¾
-1
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1629¾
-1
72.25
Bourton
pass
1635
pass
1632¾
-1
74.46
Swindon South Marston Jn
pass
1636½
pass
1633¾
-2
75.58
Swindon Stratton Green
pass
1637
pass
1634½
-2
76.27
Highworth Jn
pass
1637½
pass
1634¾
-2
76.59
Swindon East Loop
pass
1637½
pass
1635¾
-1
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1636½
1639¾
DM
DM
82.67
Wootton Bassett Jn
pass
1645
pass
1644¼
DM
DB
89.57
Little Somerford
pass
1649
pass
1648¼
94.16
Hullavington
1
pass
1651½
pass
1650¾
99.76
Badminton
pass
1655
pass
1653
-1
104.40
Chipping Sodbury
pass
1657½
pass
1656
-1
107.09
Westerleigh Jn
½
pass
1659
pass
1657½
-1
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1701½
1704
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1706
116.45
Pilning [PIL]
2
pass
1708½
pass
1709
118.03
Severn Tunnel East
pass
1709½
pass
1710
122.31
Severn Tunnel West
pass
1713
pass
1713¼
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1714¾
DT
DM
125.66
Magor
pass
1715½
pass
1716¼
130.72
Llanwern West Jn
pass
1719
pass
1719¾
131.63
East Usk Jn.
pass
1719½
pass
1720¼
132.55
Maindee East Jn
pass
1720½
pass
1721¼
ML
132.77
Maindee West Jn
pass
1721
pass
1722¼
+1
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1723¼
1724½
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1726¼
DM
134.68
Ebbw Jn
pass
1726½
pass
1727
DM
DM
138.41
Marshfield
1
pass
1729
pass
1729¾
142.42
Rumney River Bridge Jn
pass
1732½
pass
1732
143.01
Pengam Jn
pass
1733
pass
1732½
143.46
Moorland Road Junction
1
pass
1733½
pass
1733¼
DM
DR
144.16
Long Dyke Jn
pass
1735
pass
1734
E
144.79
Cardiff East
pass
1736½
pass
1735¼
-1
DR
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
4
1737
1739
1737½
1739½
1737½
1740
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1743½
+1
D
DM
149.14
St Fagans L C
pass
1744½
pass
1746
+1
154.08
Miskin
pass
1748½
pass
1750
+1
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1752
+1
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1756½
+4
161.41
Pencoed [PCD]
1
pass
1754½
pass
1759¾
+5
164.42
Tremains
pass
1757
pass
1803½
+6
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1805¼
1807
+7
DM
DM
169.46
Stormy
½
pass
1804½
pass
1812¼
+7
171.21
Pyle [PYL]
1
pass
1806
pass
1813½
+7
173.45
Margam Moors Jn.
pass
1807½
pass
1814¾
+7
DM
175.12
Margam East Jn
pass
1808½
pass
1816
+7
176.00
Margam Middle Jn
pass
1809
pass
1816¼
+7
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1818½
1820
+7
179.38
Baglan [BAJ]
1
pass
1814½
pass
1823
+8
180.09
Briton Ferry East
pass
1815½
pass
1823½
+8
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1824¾
+8
181.38
Court Sart Jn
pass
1816½
pass
1824¾
+8
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1826½
1828½
+8
185.06
Skewen [SKE]
1
pass
1824
pass
1831¾
+8
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1833¾
+7
189.42
Landore Junction
pass
1831
pass
1836½
+5
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1837¾
+5
190.67
Swansea [SWA]
forms 5B21 to Swansea Maliphant Iep Dpt and joins with 1L34 towards London Paddington
3
1834
1834
1840
+6
DSM
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