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 3 (31 May - 27 June) 

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) 2.32% 1.70% 1.46% 0.45% 1.71%
Total percentage of services cancelled 6.66% 5.58% 4.54% 0.45% 5.24%
Delay Minutes per 1000 miles (caused by SWR) 18.02 13.77 11.71 12.35 13.23
Percentage of Stations Cancellations 4.90% 4.54% 4.03% 0.34% 4.38%
Percentage of service on time 65.44% 74.82% 58.90% 95.06% 67.58%
Percentage of service up to 3 minutes delayed 84.18% 88.27% 76.48% 99.14% 83.53%
Percentage of services up to 15 minutes delayed 97.89% 98.39% 95.72% 99.92% 97.40%
Number of short formations 27 105 328 0 460
Percentage of trains short formed 0.30% 0.78% 2.07% 0.00% 1.16%
Number of booked services 9719 14631 16966 1432 42748
Services arriving between 30 and 59 minutes late at their final scheduled destination 28 48 187 0 263
Percentage of services arriving between 30 and 59 minutes late at their final scheduled destination 0.29% 0.33% 1.10% 0.00% 0.62%
Services arriving between 60 and 119 minutes late at their final scheduled destination 3 2 10 0 15
Percentage of services arriving between 60 and 119 minutes late at their final scheduled destination 0.03% 0.01% 0.06% 0.00% 0.04%
Services arriving 120 minutes late or more at their final scheduled destination 0 1 0 0 1
Percentage of services arriving 120 minutes late or more at their final scheduled destination 0.00% 0.01% 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) 2.07% 1.96% 1.02% 3.86% 1.66%
Total percentage of services cancelled 5.20% 4.37% 4.11% 3.86% 4.44%
Delay Minutes per 1000 miles (caused by SWR) 18.05 13.58 9.66 18.96 12.05
Percentage of Stations Cancellations 3.84% 3.94% 3.59% 3.46% 3.79%
Percentage of service on time 60.79% 70.99% 59.73% 92.08% 64.95%
Percentage of service up to 3 minutes delayed 82.05% 87.54% 77.77% 98.71% 83.05%
Percentage of services up to 15 minutes delayed 98.46% 98.80% 96.22% 99.87% 97.87%
Number of short formations 1164 1892 2569 0 5625
Percentage of trains short formed 0.95% 1.05% 1.18% 0.00% 1.05%
Number of booked services 130986 191900 231534 18115 572535
Services arriving between 30 and 59 minutes late at their final scheduled destination 348 360 2114 9 2831
Percentage of services arriving between 30 and 59 minutes late at their final scheduled destination 0.27% 0.19% 0.91% 0.05% 0.49%
Services arriving between 60 and 119 minutes late at their final scheduled destination 100 127 472 2 701
Percentage of services arriving between 60 and 119 minutes late at their final scheduled destination 0.08% 0.07% 0.20% 0.01% 0.12%
Services arriving 120 minutes late or more at their final scheduled destination 15 10 40 0 65
Percentage of services arriving 120 minutes late or more at their final scheduled destination 0.01% 0.01% 0.02% 0.00% 0.01%