Trains are designed to ensure passenger safety in case of collisions. With 848 passengers on board, the additional weight of 50,880 tons brings the total weight to 1,050 tons.

Consider the minimal impact experienced if a train weighing over 1000 tons collides with a car or truck. Typically, a passenger car weighs one or two tons, and even a large truck does not exceed 20 tons. Hence, a collision with a train would not significantly impede the train's speed.

In the scenario where a train has 500 seats and passengers weighing 60kg each, the collective weight amounts to 3000 kg, making it the lightest load on the train. Due to the train's substantial weight, collisions with other trains result in less severe impacts compared to car collisions.

Therefore, trains do not feature seat belts due to their significant speed and weight.