Possible Clues:

• Train heard in nursery
• Something online for minors, I say, drinking liquor
• Tot's toy on a track
• Baby train?
• Sounds childish leaving station to say chew things over a couple of times
• Sound bites featuring Thomas the Tank Engine?
• 'Chattanooga '
• A baby's train
• Train to eat and eat, say
• Child's word for train