The sole time I'd avoid the train may be the early morning peak – say seven.30am-8.50am when trains are often genuinely crowded, and chances are you'll obtain it challenging to enter using your baggage. Alternatively you can buy an esim before you arrive or on arrival from on the list https://sydney-international-airp96295.blogoxo.com/30619878/what-does-sydney-international-airport-taxi-limousine-mean