Greater Anglia and Network Rail admit they're no closer to solving the problems which have dogged rural train services across the east for more than a week.
Engineers have been manually operating barriers and using a system of flags to warn train drivers.
Watch Rob Setchell's full report below.
It's led to dozens of trains being cancelled or delayed. Both companies say they're working round the clock to find out what the problem is.
Our engineers have been working round the clock to investigate why we are having problems with the track signalling system, which has led to us reducing the number of services we can run. We are examining every factor including components of the signalling system, the impact of leaf fall, and the interaction between the signalling system and passenger trains, old and new."
The delays and cancelations affect rural routes serving the following stations:
"We both fully appreciate that this situation is extremely frustrating for passengers and it is an absolute priority for us to get these problems resolved as soon as possible. We will provide a further update as soon we have more detail. We plan to restore normal services for our passengers as soon as we can. In the meantime, Greater Anglia is making sure that customers can still complete their journeys.”