Abstract: At approximately 2:30 p.m. on or about January 21, 1991, Employees #1 and #2 went into the rail tank car cleaning building. Upon entering the building, they smelled propane gas. Employee #1 instructed Employee #2 to walk along a catwalk to see if the propane leak was near the pipes running along the catwalk. Employee #2 walked up and discovered that a valve was partially open and leaking propane gas. The propane was being bled out of a rail tank car so it could be cleaned. Employee #2 turned off the valve and the employees started to leave the building. As they passed a circuit breaker box, Employee #1 decided to turn off the lights by turning off one of the main breakers. When he did so, a spark set off an explosion. Employees #1 and #2 suffered burns and were hospitalized.