Officers are appealing for witnesses after a nine-year-old child was assaulted onboard a train from London to Sheffield.
On Sunday 23 April onboard the 9:31 am service from London St Pancras, between 11 am and 12.46 pm a child was assaulted by a man he was travelling with.
The service was met by officers at Derby Railway Station following reports by passengers.
Officers are keen to hear from anyone who may have witnessed this incident. Please contact officers by text 61016 or call 0800 40 50 40 reference 2300045510.
A 42-year-old man was arrested and has been bailed pending further enquiries.