Once the steel work reached track level at the Lethbridge end, it was possible to begin using a huge travelling crane called an "erection traveller" which was used to lower the steel beams and girders into place.
Once the steel work reached track level at the Lethbridge end, it was possible to begin using a huge travelling crane, pictured here, called an "erection traveller". It was used to lower the steel beams and girders into place.