CREATE TABLE table_72972 ("Segment description" TEXT, "Date opened" TEXT, "Line ( s ) " TEXT, "Endpoints" TEXT, "# of new stations" TEXT, "Length  ( miles ) " TEXT)

How many lines have the segment description of red line mos-2 west?
SELECT "Line(s)" FROM table_72972 WHERE "Segment description" = 'Red Line MOS-2 West'
SELECT "Line(s)" FROM "table_72972" WHERE "Segment description" = 'Red Line MOS-2 West'