When your country’s leader is a fat man who inherited everything he’s got from his dad, is always threatening war against other countries, disappears anyone he doesn’t like, lives in opulent luxury while the people suffer in poverty, and demands absolute obedience from the members of his party by appointing people to top government positions based only on their personal loyalty to you.

(Who else fits this description…?)

Except that Sodor is noted to be in the United Kingdom, which means Thomas was loyal to His Britannic Majesty and served his king and country, not those Nazi scum.