Young woman groped by elderly man

A young woman has allegedly been indecently assaulted by an elderly man during a train trip from Sydney.

An 81-year-old man began chatting with the 22-year-old while they travelled from Sydney's central station to Campsie on Tuesday morning.

But he then touched her inappropriately and tried to kiss her several times, police say.

The woman moved away and left the train before reporting the alleged indecent assault to police.

The man turned himself into police on Wednesday afternoon and charged with indecent assault.

Bail was granted with strict conditions and he's due before Burwood Local Court in February.