Not always. But most of the time when you have to do it, it is in the rear portion for some reason. That is the reason I became a Hogger. UPRR engineer knows the area I'm going to talk about. It was a cold winter night in December at about 2:00 a.m. when our (I think it was this long) 8000 foot auto train came to a halt just west of a place called Carter, Wy. 6 inches of snow on the ground, blowing about 20 mph and probably 10 degrees outside not counting the windchill. The area has a couple of s-curves in it and the terrain undulates which caused the air hoses to un-couple on about the 5th car from the rear. As I began my trek outside of the cab, my Hogger put his feet up on the control stand and said as nicely as possible, enjoy the walk. I had a great time for 2 hours let me tell you.
Most of the time though on thru-freight runs, you as the Conductor just pull your paperwork for your train as you begin your shift, call out signals with the Engineer and keep a log-book of signals displaying anything other than a clear/green color, and make any set-outs/pick-ups along the way (which may only happen 1 or 2 times a month) depending upon what type of train you have. And if for some reason you don't make it to point b before you run out of time (12 hours) you have to "tie" the train down, meaning put enough hand brakes on the train to prevent it from rolling away when you guys get off of it. Now if you work in the yard or a local job taking cars to and from business, you'll be up and down, here and there, and on your feet most of the shift.