Track on fire?

When I was driving home from campus, I glanced over to see that the train tracks were on fire!  I sped home and grabbed N, and we watched by the side of the road and tried to figure out what they were doing.  This was right next to Reconciliation Park, and we pulled into that handy little turn around spot just where 30th and Ruston Way split apart.  We thought it was for a repair, but N had some interesting speculations about train sabotage and naughty leprechauns.  The mind of a 5 year old is a fascinating place.