Excess leaves on line mean already crammed trains will be made shorter this week as carriages have been removed for repairs.
Train operator Northern warned commuters that services are likely to be even busier than normal because of the adverse Autumn conditions.
Leaves on the track have put 20 Northern train carriages out of action, the company said.
Rails are more slippery because the leaves act like black ice on the roads, a video for the train company explains.
They also damage wheels – causing flat spots when trains skid and the brakes are applied – making it more likely trains will have to be taken out of service, the company said.
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The type of leaf on the line also plays a part in how bad the disruption will be, with the company listing horse chestnut, sweet chestnut, sycamore, poplar, lime and ash leaves as the top six worst offenders.
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Carriages have been taken out of service so the wheels can be removed and replaced.
Particularly bad weather conditions last week mean 20 carriages are now being repaired, a Northern spokesman said.
The company uses jet sprays attached to the front of its trains to put sand on to the tracks to remove leaves, he added.
Due to excess leaves on the line, some services will be busier than normal this week, Northern said in a tweet this morning.
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Customers are advised to check before they travel and we are sorry for any inconvenience.
It continued: Were sorry several of our trains have been shorter and more crowded than normal this week.
Autumn conditions mean the rails are slippery which can lead to flat spots on train wheels.
Our depot teams are working round the clock to repair them and get trains safely back into service.
Network Rail also operates special trains throughout Autumn to improve conditions.
In October, Network Rail, which manages the countrys railway infrastructure, announced plans for eight leaf-buster trains which cover the North West and blast leaves off the railway line.
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