Train is related to Transportation. Transportation is a synonym of Fare. Fear is etymologically related to Fare. Fear is related to Factor. 
Chief is related to Operating. Operating is related to System. 
Train <--RelatedTo--> Transportation <--Synonym--> Fare <--EtymologicallyRelatedTo-- Fear <--RelatedTo--> Factor 
Chief <--RelatedTo--> Operating <--RelatedTo--> System 