A statement just released by East Midlands Railway - they run into London St Pancras International -
quoted:
Heavy rain is flooding the railway, impacting:
•Sheffield/Derby-London St Pancras
•Crewe-Nottingham-Newark Castle
•Nottingham-Derby-Matlock.
You may use your EMR ticket to travel tomorrow.
You may also use your EMR ticket to travel today on alternative routes.
We are trying to source buses, however, some roads are also flooded so these may be limited.
Disruption is expected to continue until end of day today.
You are able to find full details on alternative routes, and impacted routes on our website here:
https://eastmidlandsrailway.co.uk/#updates
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More detail for the entire network: https://www.networkrail.co.uk/