If one of the images has two separate trains on two separate tracks.
return images ;return separate  trains in  #1 ;return separate  tracks in  #1 ;return #2 on #3 ;return number of  #4 for each  #1 ;return #1 where  #5 is equal to  two  ;return number of  #6 ;return if  #7 is equal to  one
['select', 'project', 'project', 'filter', 'group', 'comparative', 'aggregate', 'boolean']