It's about growing older ("young today, old as a railroad tomorrow..." and "days are drops in the river to be lost...")
and loosing your 'glory' days, numerous friends visiting and hanging out ("birds of a feather"), and only having that one other person beside you in the end (like a spouse: "...on the long night we've made...") and finally no one( "No ghost of course in here").
It's about growing older ("young today, old as a railroad tomorrow..." and "days are drops in the river to be lost...") and loosing your 'glory' days, numerous friends visiting and hanging out ("birds of a feather"), and only having that one other person beside you in the end (like a spouse: "...on the long night we've made...") and finally no one( "No ghost of course in here").
It's about being completely alone in the end.