A photo from our good friend, Matt’ Johnson, showing a very early system map (circa 1974 to 1979) for the MARTA commuter rail system in Atlanta. Compare to the current map here. Click on the source link at the bottom of the post to read Matt’s comprehensive notes over on Flickr.
I’ll just note that I really like the clean, uncluttered design; especially the subtle grey background with the underlying and unlabelled road network reversed out in white.
Source: tracktwentynine/Flickr