First Great Western says services running through these stations may be delayed by up to 20 minutes at short notice.
It added an estimate for the resumption of normal services will be provided as soon as it has fully assessed the problem.
Check the First Great Western site for details.
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The crash, which took place at about 7am today (Thursday), involved three vehicles. One man sadly died as a result of the collision and his next of kin have been informed.