Sometimes the weather just won't work in your favour. Just as yesterday, the fog stayed thick until well after the TranzAlpine had gone past Cass, so my nice plans were foiled, and I had to improvise. The result could definitely be worse.
Trains on KiwiRail network from rail ferry terminal at Picton to Bluff. The Southern Alps are overcome at Arthurs Pass by the Otira Tunnel on 1 in 33 (3%) gradient. The longest rail bridge in NZ over the Rakaia River is near Christchurch.