Network Rail’s expenditure for Wales in the past five years (excluding interest, tax and centrally managed costs) was as follows shown in £m: 2021-22 2020-21 2019-20 2018-19 2017-18 Operating Costs 184 177 163 141 122 Traction electricity, industry costs and rates 18 19 19 19 17 Renewals 222 203 163 161 186 Enhancements 10 16 116 230 177 Total 434 414 460 551 502 The higher level of enhancement costs in earlier years is mostly due to the Great Western Electrification Programme.