Motorists are being advised that the barriers at Tallington level crossing have failed.
A team of engineers from Network Rail are investigating the problem after the barriers went down at 2pm.
A Network Rail spokesman said: "The trains are still running, but the barriers are down as a safety precaution.
"Investigations are underway."
The spokesman was unable to say when the barriers would reopen.
The number of accidents on Lincolnshire roads has put the county in the top ten of a nationwide danger list.
Data from the Department for Transport reveals there were 2,355 accidents in Lincolnshire in 2011 - 45 deaths, 366 serious and 1,944 slight injuries.
The toll puts the county in eighth place on the list, with Kent at the top with 4,211 accidents and Surrey second with 4,023.
Lincolnshire's accident rate is 5.2 per 1,000...
Two vehicles were involved in the traffic accident at the junction of Arran Road with the A606 Empingham Road in Stamford this morning. Ambulance services were called at 8.21am to attend the accident involving a red Land Rover Freelander and a black Kia. A Lincolnshire Police spokesman told stamfordpeople: "Fire crews were also called because of fluid on the road. "A female was cut out of one of the vehicles and is...