Under Siege 2: Dark Territory, Train Crash Scene

The trestle bridge scene is where the passenger train collides against the freight tanker train while the both trains are driving on the trestle bridge which creates a massive explosion wreck including a collapsed bridge where the several trains being destroyed by falling down into the gorge. Now it's a scene game since the test has completed. I am trying to make the physics which is similar to the movie. Trains; Grand Continental Express (Passenger) Nevada Petrol Express (Freight)