Our performance breakdown

Our latest punctuality and reliability performance breakdown

The four lines and which stations these include that are detailed in the tables below can be seen in this map:
Map of the South Western Railway network with the performance figures lines

Download a JPEG version of the map (287KB)


Performance data by metric — Period 4 (28 June - 25 July) 

The rail year runs from 1st April to 31st March and is split up into 13 four-week ‘periods’.

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Performance Measure Main Line Suburban Windsor Lines Main Line Island Line SWR Total
Percentage of service cancelled (caused by SWR) 1.61% 1.55% 1.46% 0.63% 1.50%
Total percentage of services cancelled 3.15% 3.68% 5.10% 0.63% 4.02%
Delay Minutes per 1000 miles (caused by SWR) 16.26 10.79 12.39 15.93 12.78
Percentage of Stations Cancellations 2.16% 2.93% 4.06% 0.47% 3.06%
Percentage of service on time 67.62% 74.89% 50.98% 88.89% 65.34%
Percentage of service up to 3 minutes delayed 85.60% 89.36% 68.86% 98.50% 81.78%
Percentage of services up to 15 minutes delayed 98.96% 98.86% 94.50% 99.95% 97.47%
Number of short formations 58 206 300 0 564
Percentage of trains short formed 0.58% 1.48% 1.87% 0.00% 1.37%
Number of booked services 10393 14704 17401 1433 43931
Services arriving between 30 and 59 minutes late at their final scheduled destination 16 25 220 0 261
Percentage of services arriving between 30 and 59 minutes late at their final scheduled destination 0.15% 0.17% 1.26% 0.00% 0.59%
Services arriving between 60 and 119 minutes late at their final scheduled destination 0 0 13 0 13
Percentage of services arriving between 60 and 119 minutes late at their final scheduled destination 0.00% 0.00% 0.07% 0.00% 0.03%
Services arriving 120 minutes late or more at their final scheduled destination 0 0 0 0 0
Percentage of services arriving 120 minutes late or more at their final scheduled destination 0.00% 0.00% 0.00% 0.00% 0.00%

Moving Annual Average (performance data by metric)

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Performance Measure Main Line Suburban Windsor Lines Main Line Island Line SWR Total
Percentage of service cancelled (caused by SWR) 2.00% 1.87% 1.02% 3.56% 1.61%
Total percentage of services cancelled 4.93% 4.22% 4.08% 3.56% 4.31%
Delay Minutes per 1000 miles (caused by SWR) 17.71 13.32 9.75 16.56 11.98
Percentage of Stations Cancellations 3.59% 3.75% 3.53% 3.18% 3.63%
Percentage of service on time 61.43% 71.73% 59.18% 91.85% 65.22%
Percentage of service up to 3 minutes delayed 82.44% 87.88% 77.34% 98.78% 83.14%
Percentage of services up to 15 minutes delayed 98.51% 98.81% 96.28% 99.90% 97.90%
Number of short formations 1073 1681 2587 0 5341
Percentage of trains short formed 0.87% 0.93% 1.19% 0.00% 0.99%
Number of booked services 131031 191860 231465 18116 572472
Services arriving between 30 and 59 minutes late at their final scheduled destination 336 356 2040 5 2737
Percentage of services arriving between 30 and 59 minutes late at their final scheduled destination 0.26% 0.19% 0.88% 0.03% 0.48%
Services arriving between 60 and 119 minutes late at their final scheduled destination 86 114 412 2 614
Percentage of services arriving between 60 and 119 minutes late at their final scheduled destination 0.07% 0.06% 0.18% 0.01% 0.11%
Services arriving 120 minutes late or more at their final scheduled destination 12 7 33 0 52
Percentage of services arriving 120 minutes late or more at their final scheduled destination 0.01% 0.00% 0.01% 0.00% 0.01%