Both the orange and the maroon on the K-Line streamliners were too dark. Nonetheless, the K-Line cars are good looking, scale size and have a generally prototypical appearance. The biggest error is the trucks on the dome cars; the real ones had six-wheel trucks. If you want scale size in a diesel-era Milwaukee Road streamliner, K-Line is your only option unless you want to look for old Walthers kits.
The last Weaver steam-era streamlined cars, which they labeled the "morning train," did not have the green windows and if I recall correctly they do have interiors. These were the arched-window cars that were built for the original 1935 Hiawatha. These cars look good only with the Weaver 4-4-2 Hiawatha locomotives. The paint clashes badly with Lionel's version of the Hiawatha Atlantic, and the plain orange sides were repainted when the railroad changed to the maroon and orange scheme so they would not be correct with a 4-6-4 or a diesel.