Picturing America--Cityscape 1, 1963

Cityscape I, 1963 by Richard Diebenkorn posted in the TV monitor area closest to the computers.  "In Richard Diebenkorn's Cityscape I, the land and buildings are infused by the strong light of Northern California.  The artist captured the climate of San Francisco by delicately combining shades of green, brown, gray, blue and pink, and arranging them in patches that represent the architecture and streets of his city."

Compare Cityscape I with Edward Hopper's House by the Railroad (located next to the video monitor).  How are the two paintings similar?  How are they different?  What moods do the reflect?