Under Siege 2: Dark Territory, Train Crash BTS

The trestle bridge scene is where the passenger train collided against the freight tanker train while on Trestle Bridge which creates a massive explosion wreck including a collapsed bridge where the several trains fell down the gorge. Now it's a Behind The Scene. I am trying to make the physics which is similar like a Movie. Trains from the Movie; Grand Continental Express (Passenger) Nevada Petrol Express (Freight)