More than 50 firefighters tackled a severe fire at a tyre warehouse.
The fire at Wyvern Tyres on the Holmer Trading Estate, which broke out on Monday night, left thick black smoke across parts of Hereford.
Some roads were closed and trains in and out of the city were cancelled amid fears a fire-hit building could collapse on to tracks.
The rail disruption was cleared and train services restored by about 1000 GMT, National Rail said.
Replacement bus services had been operating between Hereford and areas including Shrewsbury, Leominster, Great Malvern and Worcester.
Hereford and Worcester Fire and Rescue Service said it was called to the fire scene at about 1945 GMT on Monday.
It said crews from 10 fire engines tackled the blaze at its height and had the fire under control by 2300 GMT.
However soon after they received reports of a partial collapse inside the single-storey building.
There were due to be further investigations into the cause on Tuesday.
Station manager Brian Morgan, from the fire service, said because of the potential for further collapse of the building he imagined it would be "very difficult to establish the cause".
He added: "It's an industrial unit that's been split up into numerous little lock ups and individual units.
"The fire initially started (in the tyre depot) but because of the nature of it, it's actually affected a number of other units all the way through the industrial unit."
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