Hello phoenix24
No, there are neither carts nor porter services available.
Luggage is free on Swiss trains and not limited in either size or number; However, the tariff regulations assume that the luggage is exclusively used for travel and one is able to carry all luggage themselves.
If you travel with too many pieces you should consider using the SBB luggage transfer service instead.
Moreover, keep in mind that the space on board the trains is limited, and you will not be the only one having luggage. In the worst case you are asked to deboard if safety on board is no langer granted.
https://sbb-tickets.cc/en/tickets-offers/reservation-luggage/luggage-registration.html
Kind regards,
Roland