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1B21 1548 London Paddington to Swansea
Departing on 9th January 2026

operated by
Great Western Railway
10 coaches
800008
800035
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
1547½
3
0.41
Royal Oak Junction
pass
1549
pass
1548¾
3
2
1.28
Portobello Jn (London)
pass
1550½
pass
1550
1.68
Ladbroke Grove
pass
1551
pass
1550¾
2
DM
2.55
Old Oak Common East
pass
1551½
pass
1551½
3.15
Old Oak Common West
pass
1552
pass
1552
3.48
Friars Jn
pass
1552½
pass
1552¼
4.16
Acton Main Line [AML]
pass
1553
pass
1553
4.75
Acton West
pass
1553½
pass
1553¼
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
1555¾
10.66
Hayes & Harlington [HAY]
1
pass
1556½
pass
1556½
11.09
Heathrow Airport Jn
pass
1556½
pass
1556½
ML
12.04
Stockley Junction
pass
1557
pass
1556¾
12.62
West Drayton East
pass
1557½
pass
1557¼
13.12
West Drayton [WDT]
1
pass
1557½
pass
1557¾
13.26
West Drayton Jcn
pass
1557½
pass
1557¾
14.55
Iver [IVR]
1
pass
1558
pass
1558¼
16.13
Langley [LNY]
1
pass
1559
pass
1559¼
17.13
Dolphin Jn
pass
1559½
pass
1559¾
18.31
Slough [SLO]
2
pass
1600
pass
1600¾
ML
19.06
Slough West
pass
1600½
pass
1601
20.72
Burnham [BNM]
pass
1601½
pass
1602
22.34
Taplow [TAP]
1
pass
1602
pass
1603
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
1606¼
30.76
Twyford [TWY]
1
1
pass
1606½
pass
1607
ML
31.57
Twyford West
pass
1607
pass
1607½
35.10
Kennet Bridge Jn
pass
1609½
pass
1609½
35.56
Reading Main Line East
pass
1610
pass
1610¼
35.75
Reading [RDG]
9
1611
1613
1611
1613
1611¼
1613½
DM
DM
36.12
Reading Main Line West
pass
1613½
pass
1614¼
36.45
Reading High Level Jn
pass
1614
pass
1615¼
+1
ML
38.29
Tilehurst East Jn.
pass
1615
pass
1616¼
+1
38.47
Tilehurst [TLH]
1
pass
1615
pass
1616¼
+1
41.38
Pangbourne [PAN]
pass
1617
pass
1617½
44.55
Goring & Streatley [GOR]
1
1
pass
1619
pass
1619½
ML
48.32
Cholsey [CHO]
1
pass
1621
pass
1621
51.32
Moreton Cutting
pass
1623
pass
1622¼
52.61
Didcot East Jn
pass
1624
pass
1623
53.05
Didcot Parkway [DID]
1
pass
1624
pass
1623½
53.20
Didcot West End
pass
1624
No report
53.50
Foxhall Jn [XJF]
pass
1624½
pass
1623¾
55.14
Milton Junction
pass
1625
pass
1624
-1
56.27
Steventon
pass
1626
pass
1624¾
60.17
Wantage Road
pass
1628
pass
1628¾
63.75
Challow
pass
1630
pass
1631¾
+1
66.34
Uffington (Oxfordshire)
1 ½
pass
1631
pass
1632¾
+1
72.25
Bourton
pass
1635
pass
1635¾
+1
74.46
Swindon South Marston Jn
pass
1636½
pass
1636¾
75.58
Swindon Stratton Green
pass
1637
pass
1637½
76.27
Highworth Jn
pass
1637½
pass
1637¾
76.59
Swindon East Loop
pass
1637½
pass
1638¾
+1
77.18
Swindon [SWI]
4
1638
1640
1638½
1640½
1639¾
1641
DM
DM
78.31
Rushey Platt
pass
1642
pass
1642½
82.67
Wootton Bassett Jn
pass
1645
pass
1645½
DM
DB
89.57
Little Somerford
pass
1649
pass
1649½
94.16
Hullavington
1
pass
1651½
pass
1652
99.76
Badminton
pass
1655
pass
1654½
104.40
Chipping Sodbury
pass
1657½
pass
1657¼
107.09
Westerleigh Jn
½
pass
1659
pass
1659
111.57
Bristol Parkway [BPW]
2
1702
1704
1702½
1704½
1702¾
1705
DB
DT
112.79
Patchway [PWY]
2
pass
1706
pass
1706½
116.45
Pilning [PIL]
2
pass
1708½
pass
1709½
+1
118.03
Severn Tunnel East
pass
1709½
pass
1710¾
+1
122.31
Severn Tunnel West
pass
1713
pass
1714
+1
123.41
Severn Tunnel Junction [STJ]
3
pass
1714
pass
1715½
+1
DT
DM
125.66
Magor
pass
1715½
pass
1717
+1
130.72
Llanwern West Jn
pass
1719
pass
1720¾
+1
131.63
East Usk Jn.
pass
1719½
pass
1721¼
+1
132.55
Maindee East Jn
pass
1720½
pass
1722¼
+1
ML
132.77
Maindee West Jn
pass
1721
pass
1723
+2
133.31
Newport (South Wales) [NWP]
2
1722
1724
1722
1724
1724¼
1725¾
+1
DM
DM
134.13
Gaer Jn
pass
1725½
pass
1727½
+2
DM
134.68
Ebbw Jn
pass
1726½
pass
1728½
+2
DM
DM
138.41
Marshfield
1
pass
1729
pass
1731¼
+2
142.42
Rumney River Bridge Jn
pass
1732½
pass
1733½
+1
143.01
Pengam Jn
pass
1733
pass
1734
+1
143.46
Moorland Road Junction
1
pass
1733½
pass
1734¾
+1
DM
DR
144.16
Long Dyke Jn
pass
1735
pass
1735¼
E
144.79
Cardiff East
pass
1736½
pass
1736¼
DR
E
145.11
Cardiff Central [CDF]
Pathed as Class 80x on diesel from here
3
1737
1739
1737½
1739½
1737¾
1739¼
E
D
145.37
Cardiff West
pass
1740½
No report
146.36
Leckwith North Jn
pass
1742½
pass
1742½
D
DM
149.14
St Fagans L C
pass
1744½
pass
1745
154.08
Miskin
pass
1748½
pass
1749
156.21
Pontyclun [PYC]
1
pass
1750½
pass
1750¾
156.57
Llantrisant [LTI]
pass
1751
No report
158.53
Llanharan [LLR]
2
pass
1752½
pass
1753
161.41
Pencoed [PCD]
1
pass
1754½
pass
1754¾
164.42
Tremains
pass
1757
pass
1756¾
165.26
Bridgend [BGN]
1
1758
1800
1758
1800
1758½
1800½
DM
DM
169.46
Stormy
½
pass
1804½
pass
1805
171.21
Pyle [PYL]
1
pass
1806
pass
1806¼
173.45
Margam Moors Jn.
pass
1807½
pass
1807¼
DM
175.12
Margam East Jn
pass
1808½
pass
1808¾
176.00
Margam Middle Jn
pass
1809
pass
1808¾
176.70
Port Talbot East
pass
1810
No report
177.39
Port Talbot Parkway [PTA]
1
1811
1812
1811
1812½
1811
1812
179.38
Baglan [BAJ]
1
pass
1814½
pass
1814¾
180.09
Briton Ferry East
pass
1815½
pass
1815
181.20
Briton Ferry [BNF]
1
pass
1816½
pass
1816¼
181.38
Court Sart Jn
pass
1816½
pass
1816
183.00
Neath [NTH]
1 2½
1
1819
1820
1818½
1820
1818
1819½
185.06
Skewen [SKE]
1
pass
1824
pass
1822¾
186.68
Llansamlet [LAS]
1
pass
1826½
pass
1824¾
-1
189.42
Landore Junction
pass
1831
pass
1827½
-3
DM
DSM
190.23
Swansea Loop East
pass
1832
pass
1829
-2
190.67
Swansea [SWA]
forms 5B21 to Swansea Maliphant Iep Dpt and joins with 1L34 towards London Paddington
3
1834
1834
1831¼
-2
DSM
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