Springfield Road in Grantham has been closed at its London Road junction after a skip lorry struck the railway bridge earlier today.
Motorists are asked to avoid Springfield Road after the skip lorry collided with the bridge at about 11am and created a large crack.
The lorry driver sustained some injuries, but these are not thought to be serious.
As a result of the damage to the bridge, engineers from Network Rail have been at the scene and are investigating. Springfield Road has had to be closed from London Road to the bridge and from the bridge to Stamford Street.
Trains are still travelling over the bridge, which carries the main East Coast line to London, but at reduced speed.
A National Rail spokesman said: “A vehicle has struck a bridge at Grantham, it has been inspected and cleared for trains to run normally. There are residual delays of up to 65 minutes through Grantham while services recover. These delays are expected to continue until 4pm.”.
Springfield Road will remain closed for the next few hours whilst the bridge continues to be checked and examined.