Map showing what parts of an Amtrak route are traversed during daylight

I remember seeing a map of individual Amtrak routes that showed which parts of the train route were traversed in daylight for each direction. I've looked on Amtrak's website and checked the schedules and route guide PDFs but can't find it. Are these still available? Where can I find them?

I believe the maps were in official Amtrak pamphlets for a given route. Along each side of the route map it had a red line for day and blue for night.

I'm considering taking a cross-country trip, but flying one way in the interest of time. I was hoping to use these maps to evaluate different routes and what direction I might want to travel to see some of the prettiest sights.

I could use schedules, but that might be a bit tedious to do for each of the long distance routes and also "a picture is worth a thousand words". I do realize that sunrise/sunset changes from day-to-day and trains can be late, but I imagine it'd still be fairly useful.