PASSENGERS are facing delays of up to 15 minutes on trains between Reading and Didcot Parkway.
There is a broken down freight train between Goring and Streatley.
First Great Western confirmed on Twitter that all lines have been blocked and services are delayed.
It said: "Due to a broken down freight train between Reading and Didcot Parkway all lines are blocked. Services may be delayed by up to 15 mins."