RAILROAD CONDUCTOR AND ENGINEER?

I HAVE ALWAYS WONDERED THIS, I KNOW I HAVE ASKED MANY QUESTIONS ABOUT CONDUCTOR'S AND ENGINEERS, BUT WAS WONDERING, IS BEING A CONDUCTOR A HARD JOB, SINCE A CONDUCTOR HAS SO MUCH RESPONSIBILITY, OR IS IT HARDER AS AN ENGINEER, ALSO WHAT'S THE HARDEST TO WORK FOR AS A CONDUCTOR AND ENGINEER, A FREIGHT RAILROAD, OR COMMUTER RAILROAD(METRA)?