 SMZ added the motor ship the Koningin Wilhelmina in 1960.In 1968, the two Ro-Ro passenger vessels (the British-owned St George and the Dutch-owned Koningin Juliana) came into service, the St George in July and the Koningin Juliana in October.This fully integrated service was operated from November 1968 under the Sealink banner with each ship leaving port by day and returning overnight.