They usually organize buses from the station to the circuit. Here you can find some more information: https://www.monzanet...ow-to-reach-us/
Otherwise, it is approx 45 mins / 1 hour walk from the station to the circuit. If it does not rain, it is quite a pleasant stroll through the city center (it is a pedestrian area) and the park (including passing through the nice Villa reale garden). I used to live near the train station, and did this myself a few times
https://goo.gl/maps/HT4K7fb5KnC9X6U77
Edited by CaptHaddock91, 31 August 2022 - 08:19.