Basically every vehicle has it but in trains/trams is it particularly strong (probably because they have so much mass).
In: Physics
This jolt can be explained by a property known as jerk. Just like acceleration is how fast you are changing speed, jerk is how fast your acceleration is changing.
When a vehicle is slowing, it is typically done at a constant rate of acceleration, for the comfort of the passengers. However, when the speed reaches zero there is a sudden change in acceleration from the rate you were decelerating at to an acceleration of zero (You do not start moving backwards, which would happen if you maintained constant acceleration). It is this jerk that you are feeling.
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