There are a number of trains that could work for you. Do you have a time you'd like to arrive by? Or a day of the week you'd like to travel?
I'm headed to Cambridge on Tuesday.
Train TR7307 leaves Peterborough at 12:48 Tuesday, and will arrive at Cambridge by 13:38. Would you like me to book it for you?
I don't want to book yet but could you tell me the travel time?