It happened earlier this morning.
A lorry has struck a bridge just north of Chesterfield train station.
An assessment of any damage which may have been caused began at 10.15am.
As a result, trains between Sheffield and Chesterfield are expected to be delayed for up to 10 minutes.
#EMTUpdate Trains between Sheffield & Chesterfield may be delayed by 5-10 minutes because of a lorry striking a bridge north of Chesterfield station. Staff are expected to the bridge for 1015 so they can carry out an assessment of any damage that may have been caused. pic.twitter.com/lkaCuWJlsw— East Midlands Trains (@EMTrains) July 11, 2019