The Rail Accident Investigation Branch looks into a train coming off the track last summer.
National Rail says services are beginning to get back to normal but some delays could remain.
New East West Rail station still closed after row between unions and the rail operator over staffing.
A council says it is ready to restart the service after a "catastrophic fire" at a waste facility.
The call comes after it suspends dry recycling collections after a blaze at a waste storage centre.
Kerbside dry mixed recycling is not being collected by Central Bedfordshire Council.
The East West Rail company wants to build a maintenance yard for the new Oxford-Cambridge route.
A council agrees to give between £3m and £5m towards the project.
East West Rail wants to build a maintenance depot, but people living in a village are not happy.
