wife & I were coming down the long curve on US 40 east of cumberland Md.

Damned comp wouldnt accept time of 1730, just starting to get dark, but not enough for stars. A few puffy clouds. 
One cloud, however, was black & puffy at one end & rectangular at the other.  Too early for stars, but visible near black were 3 lights, color of incandescent. 
Suddenly from the black cloud came, like a yo-yo another light & zipped back into the black cloud. 
The 3 lights origanally visibile had not moved, but the triangle they formed was larger than the black cloud.  
As soon as the yo-yo light had returned to the "mother ship" the other 3 lights moved to the black cloud & were engulfed. 
Wife & I watched until we climbed the mountain on the other side & never saw another light.