Brother One made a shocking statement: "These bastards don't even spare the trains. They not only keep mistresses, but also damn well 'keep' trains."
(Note: This sentence contains vulgar language and may not be suitable for all audiences. An alternative translation could soften the language depending on context.)
Alternative: Brother One shocked everyone by saying, "These guys are outrageous. They don't even leave trains alone. Not only do they keep mistresses, but they also 'privatize' trains."