Since most of the Amtrak activity is towards 8th Avenue, it is most of the distance from 7th to 8th Avenue. I still recommend asking for wheelchair assistance. It may take a while to get someone, but it is a good idea nonetheless Sometimes people on this board have one day C/A passes that they are not using before expiration, and offer them to other members, perhaps someone out there will respond. The regular passenger waiting area is ok, C/A can be a bit crowded, but is still a step up. You will definitely want a red cap to take you down to the train, set it up in advance when you get there, don't wait till they call the train..