Tube lines face autumn delays from fallen leaves
Network Rail deploys specialist trains to combat slippery tracks and ensure safe journeys across London.
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Londoners travelling on the Tube and National Rail this autumn may experience delays due to fallen leaves on tracks. These leaves, particularly when damp, compress under train wheels to form a slippery layer. This condition, known as low rail adhesion, makes it harder for trains to accelerate and brake safely, leading to slower journeys and potential disruptions.
Which Tube lines are affected?
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Planned upgrades will shut sections of the line from October 28 to November 1, affecting journeys to Heathrow.
While much of the Underground network operates underground, several lines have outdoor sections vulnerable to leaf fall. The Piccadilly, Metropolitan, Central, and Northern lines are among those where Transport for London (TfL) deploys specialist equipment. These lines can be particularly affected in suburban areas with numerous trees lining the tracks. TfL has previously used rail adhesion trains, known as RATs, to apply a treatment called Sandite, a mixture of sand and metal particles, onto the rails to improve traction.
How Network Rail tackles the problem
Network Rail operates 67 specialist leaf-busting trains across Britain each autumn to clean affected sections of track. These trains use powerful water jets to remove compressed leaves and can also apply a special gel containing sand and steel particles to enhance grip between wheels and rails. Maintenance crews also treat sections by hand where necessary and use specialist weather forecasts to identify high-risk areas. Throughout the year, Network Rail manages vegetation alongside railway lines to minimise potential disruption.
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No single threshold exists, with operators assessing multiple risks before cancelling services.
The issue extends beyond the Underground, impacting London Overground and National Rail services that run through wooded areas, parks, and suburban neighbourhoods. Beyond reduced adhesion, leaf residue can interfere with signalling systems that rely on electrical connections to detect train presence. This can cause following services to be held until the track is clear and safe.
When leaf fall causes disruption
While leaf fall does not automatically lead to cancellations, severe conditions can cause significant disruption. Trains may operate at reduced speeds or require longer to accelerate and brake. In some cases, operators may introduce temporary autumn timetables to allow for longer journey times through affected areas. In extreme circumstances, trains might be unable to proceed until the track is treated and deemed safe. The extent of disruption depends on weather, the number of trees, and the speed of leaf fall. The primary period of concern is October and November, though this can vary. Passengers are advised to check journey updates, particularly after periods of wet or windy weather.
Questions this report answers
+Why do fallen leaves cause delays on the Tube?
Fallen leaves on damp railway tracks compress under train wheels to create a slippery layer. This reduces the grip between the wheels and the rails, a condition known as low rail adhesion. It makes it harder for trains to accelerate and brake safely, leading to slower journeys and potential delays.
+Which Tube lines are most affected by leaves?
The Piccadilly, Metropolitan, Central, and Northern lines are most affected because they have outdoor sections where leaves can fall onto the tracks. These lines can be particularly vulnerable in suburban areas with many trees lining the railway.
+How do railway operators deal with fallen leaves?
Network Rail operates specialist leaf-busting trains that use water jets to clean tracks and apply treatments to improve grip. They also deploy teams for manual treatment and use specialist weather forecasts to target problem areas. Throughout the year, they manage vegetation near the tracks.
+What should passengers do during autumn?
Passengers travelling on the Tube or National Rail during autumn are advised to check their journey status before travelling. This is especially important after periods of wet or windy weather, as these conditions can exacerbate leaf fall issues and lead to unexpected delays.
WE FILE
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The London Travel Desk assembled this report from the outlets listed below. Language-model drafting is reviewed under human editorial supervision, with scoring notes and corrections kept visible.
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