Fireworks

 Electrical Arcing at the Southern California Railway Museum.

The track was relocated but the overhead hadn't been yet. So the brakeman had to try and guide the trolley wheel. But when the wheel left the wire, fireworks ensued.

One thing the video didn't capture was the brilliant green color of the arching: 

Enjoy the fireworks and have a happy 4th of July.

Yes sir! Happy 4th of July!

Dandy