"Train ABC" uses each letter of the alphabet to introduce children to the exciting world of trains and railways. This rhyming journey covers everything from the train's arrival ('A') and parts like the 'Engine' ('E') and 'Wheels' ('W'), to the people involved like the 'Conductor' ('C') and 'Operator' ('O'), aspects of the trip such as the 'Journey' ('J') and 'Station' ('S'), and even safety points like 'X-crossing' ('X'), providing a fun and educational overview of train vocabulary from A to Z.