Yesterday morning around 3:30 am, hazmat crews detonated explosives and ignited the flammable contents of two tank cars, one was propane and one was butane, involved in a train derailment in MN. The explosions were designed to pierce the hulls of two cars, one carrying propane, the other butane. Incident Command determined that the “vent and burn” procedure was the only option after determining there was no other way to safely recover the flammable pressurized gas remaining in the LP car damaged in the derailment, and no way to access the scene to pump off the butane car. If you have never seen a “vent and burn” you can see videos of this technique Here (Transport CA Training Video) and Here (2012 I-10 V&B).