Lyric discussion by calendar girl 

Cover art for Theysay lyrics by Josiah Leming

they say, nothing comes from going against their grain and oh, we are the diggers of our own graves and we will crash and burn before our train leaves this town

this could mean to that no use trying to do things differently from those before them cause you are just killing yourself for nothing (figuratively) and your dreams of a better tomorrow or the world will all come crashing down on you before you barely began your life's journey

he could also be referring in the whole song to something more simple..his desires to leave his town and follow his dreams instead of the status quo life those around him (parents/grandparents) want him to have instead (school/job/marriage/grow old) and him saying I am not doing it your way.