Network Rail says major disruption is expected until the end of the day.
The two men were arrested after a long-running investigation into organised thefts of high value cars.
Georgia Nixon and Stacey Almond are among those turning a nose for a bargain into a business.
One resident says she hopes further signage or traffic-calming measures are installed.
It is 12 months since the body of Jesbir Singh Khela, from Letchworth, was found near Langford.
A hospice charity is closing many of its services covering dementia, transport and its cafe.
Engineers were on site to fix a "complete failure of the signalling system".
Police attended the scene and one lane was closed, says National Highways.
Hundreds of halls were built as alcohol-free spaces, yet their past is now forgotten, says author.
