Marbles and Train of thought

Marbles noun - The normal or healthy condition of the mental abilities.

Train of thought and marbles are semantically related. In some cases you can use "Train of thought" instead a noun "Marbles".

Train of thought noun - The connections that link the various parts of an event or argument together.

Marbles and train of thought are semantically related. Sometimes you can use "Marbles" instead a noun phrase "Train of thought".