How to validate class parameters in __init__?

I've been searching a lot for this type of problem, haven't found a single similar question on SO yet.

I have tried using a for loop to put some validation in the train's init that would disregard those passengers although with no success.

tl;dr - How do I validate which passengers will be in the passengers list when I know that some of the passengers in the passengers list are ineligble to be in the train, due to seat_nr out of range or the carriage_nr out of range.

"""Train."""


class Train:
    def __init__(self, passengers: list, carriages: int, seats_in_carriage: int):
        

        #--Insert validation for passengers allowed on train--#        

        self._passengers = passengers
        self._carriages = carriages
        self._seats_in_carriage = seats_in_carriage

    @property
    def passengers(self) -> list:
        return self._passengers

    @property
    def carriages(self) -> int:
        return self._carriages

    @property
    def seats_in_carriage(self) -> int:
        return self._seats_in_carriage

    def get_seats_in_train(self) -> int:
        return self._seats_in_carriage * self._carriages

    def get_number_of_passengers(self) -> int:
        return len(self._passengers)

    def get_passengers_in_carriages(self) -> dict:
        return {}

    @passengers.setter
    def passengers(self, value_list: list):
        self._passengers = value_list

    @carriages.setter
    def carriages(self, value: int):
        self._carriages = value

    @seats_in_carriage.setter
    def seats_in_carriage(self, value: int):
        self._seats_in_carriage = value


class Passenger:
    def __init__(self, passenger_id: str, seat: str):
        self.carriage_number = seat.split("-")[0]
        self.seat_number = seat.split("-")[1]
        self._seat = seat
        self._passenger_id = passenger_id

    def __dict__(self):
        if str(2) >= self.seat_number > str(0) and self.carriage_number <= str(3):
            passenger_dct = {'id': str(self._passenger_id), 'seat': str(self._seat)}
            return passenger_dct


if __name__ == '__main__':
    passengers = [
        Passenger('test', '1-2'),   #--"test"= passenger_id, "x-y" : x= carriage_nr, y= seat_nr// valid
        Passenger('test2', '2-3'),  #-- invalid, seat_nr=3, train carriage has only 2 seats.
        Passenger('test3', '4-2'),  #-- invalid, carriage_nr = 4, train only has 3 carriages.
        Passenger('test4', '3-2'),  #-- valid
        Passenger('test5', '1-1'),  #-- valid
        Passenger('test6', '1-0'),  #-- invalid, no seat_nr 0 on train carriage
    ]
    assert passengers[0].__dict__() == {'id': 'test', 'seat': '1-2'}

    t = Train(passengers, 3, 2)  #--passengers list, number of carriages, number of seats in carriage.
    
    print(t.get_number_of_passengers()) # -- Should print 3, instead prints all 6.

Any info regarding to the topic is much appreciated, thanks in advance!