sentences:  By the late 1960s, the holiday-peak traffic had eroded and the usual consist for most of the year was two first and two second class smoker and non-smoker carriages providing 176 seats.The main traffic for the "South Island Limited" was as a long-distance service to connect with the inter-island Union Steamship Company "Steamer Express" ferry at Lyttelton and to carry mail, with up to six ZP class wagons for maximum revenue.By 1970, steam locomotives had been almost entirely withdrawn from New Zealand.