During WW2 the Germans were also working on a transatlantic cruise missile using a mixture of coal dust, diesel and Acetone. Tests were performed with such ramjet engines atop Dornier 217 aircraft in France through the war.
Trommsdorff-D-6000-Interkontinentalflugkörper was intended to launch from high altitude bombers such as the He-277 at altitudes of 46,000ft and 0.67 Mach. After launch they would climb to 80,000ft flying at 2.8 Mach much like the SR-71 cruise altitude. They would continue their flights to USA as robots similar in concept to the V-1.
Source:
"The V2 & the German, Russian and American Rocket Program"p.89, by Claus Reuter