<TrainList> is either a single train (and in this case has the exact same syntax as a <Train> element),
or multiple trains, separated by a semicolon (;) and enclosed in parentheses.
The <TrainList> element is especially used in the M=FOLLOW Movement.
The vehicles comprising a train are separated from each other by commas.
As such, this character is not suitable for separating entire trains.
Therefore, the semicolon is used as a separator between entire trains.
The individual parameters of a Movement are also separated with a semicolon.
Because a <TrainList> is itself only a single parameter inside the Movement,
the <TrainList>, which contains multiple <Train> elements, must be enclosed in parentheses.