Lyric discussion by Mttminahan 

Cover art for Long As I Can See The Light lyrics by Creedence Clearwater Revival

It is absolutely about the underground salve route. The slaves moving north found safety from with the abolitionists signaled by a candle in the window

@Mttminahan Great man... You just answered my question about the meaning of this phrase... I never though was about slave's tales !!

@Mttminahan LMAO you is ignorant