The fire at Cleveland Industrial Estate in Darlington is causing disruption on the nearby east coast rail line.
Because of this, there are delays of up 60 minutes to trains between Northallerton and Newcastle via Darlington.
These delays will continue until further notice.
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Middlesbrough kept their unbeaten re-entry into the Premier League going drawing 0-0 at West Brom.
He has agreed a two-year contract at St. James' Park and becomes the tenth new face in the Magpies' first team squad this summer.
On the back of three consecutive Championship wins, the Magpies sit fourth, poised to move into the automatic promotion places.