On Friday, National Rail said the lines between Nuneaton and Rugby had reopened, but trains were running at a reduced speed and might still be cancelled, revised or delayed by up to 10 minutes.
Disruption was expected until at least 15:00 BST, they added.
Passengers were advised to check their routes before travelling and to allow extra time for their journeys.
The West Coast Main Line runs from London Euston to Glasgow Central and Edinburgh, with stations including Manchester Piccadilly, Wolverhampton, Birmingham New Street, Coventry and Milton Keynes along the route.
The bridge collapse affects both Avanti West Coast and London Northwestern Railway services, National Rail added.
A spokesperson confirmed tickets dated for Thursday could be used on services on Friday.
They added that, if passengers no longer wished to travel due to their train being delayed or cancelled, they could request a full refund from where they bought their tickets.
Network Rail there were 1,666 reported bridge strikes between 1 April 2024 to 31 March 2025.
A spokesperson said most of the vehicles that hit railway bridges were lorries and buses, at a cost of about £13,000 each time – costing about £23m in a year in repairs
Research as part of a campaign, they added, found more than two-fifths of lorry drivers admitted not measuring their vehicle before heading out on the road, and 52% admitted to not taking low bridges into account.
