a long northbound passenger train from Wellington crosses the old Silverstream bridge 1925

With a Ww tank engine in charge during what is clearly an organised photo run-by.  Although the gradients are light as far as Upper Hutt, they stiffened significantly after there so this may have been a race day special as far as Trentham.  This single track bridge was replaced with the present double track one further upstream with electrification in the early 1950s.  See earlier posts and our books for more.