All traces are closed at Beaconsfield, with disruption anticipated till at the very least 4.15pm.
The incident is affecting routes between Stourbridge Junction, Birmingham Moor Street, Banbury, Oxford, Aylesbury, High Wycombe and London Marylebone.
A Network Rail spokesperson mentioned: “The bridge wants to be inspected by specialist Network Rail engineers to guarantee it’s protected for trains to run beneath it.
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“Until specialist examiners are on site and fully assess the bridge, lines will remain closed.”
Services could also be cancelled, delayed by up to 60 minutes, or revised.
Until the location is said protected, no trains will likely be ready to run by Beaconsfield.
Network Rail engineers should assess the bridge earlier than reopening the traces.
Chiltern Railways passengers can use their tickets on Avanti West Coast companies between Birmingham New Street, Milton Keynes Central, and London Euston, in addition to different operators together with CrossCountry, Elizabeth line, Great Western Railway, London Northwestern Railway, and West Midlands Railway.
London Underground routes are additionally accessible for ticket holders, together with the Bakerloo line between Oxford Circus, London Paddington, and London Marylebone.
The central line is accessible between West Ruislip, South Ruislip, and Oxford Circus, whereas the metropolitan line is on the market between Amersham, Rickmansworth, Harrow-on-the-Hill, and Baker Street.
Those delayed could also be entitled to compensation and may preserve their tickets as proof.
