railwayman vs employee

railwayman and employee both are nouns.

Word	Noun	Adjective	Verb	Adverb
railwayman	Yes	No	No	No
employee	Yes	No	No	No

As nouns, employee is a hypernym of railwayman; that is, employee is a word with a broader meaning than railwayman:

railwayman (noun)	employee (noun)
an employee of a railroad	a worker who is hired to perform a job