In 2023, the length of standard gauge non-electrified railway lines in the UK stood at 10.49 thousand kilometers. The forecast for 2024 to 2028 shows a gradual decline, with a consistent decrease of 0.01 thousand kilometers each year. Year-on-year percentage variations indicate a steady decline of roughly 0.095%. The five-year compound annual growth rate (CAGR) also reflects this marginal decrease over the period.

Future trends to watch for:

Potential shifts in transport policy towards rail electrification could further decrease non-electrified lines.
Infrastructure investment trends may alter this trajectory, either slowing down or accelerating the decline.
Technological advancements and sustainability goals may impact the strategic importance of non-electrified railways.