Two sets of long string of lights

High in the Eastern sky over the Sierra Foothills I observed as I can best describe this as a two long but separate straight string of lights.  Like a.  Long passenger train might look like at night with all the light showing through open windows. I watch as the first one moved I  a north to south direction  with a 30 degrees down angle. It took 2 to 3 minutes to make its way out of view but as it did the 2nd one which was identical to the first came into view following the same path and same duration .