Work will start on lifting a 157-tonne bridge into place this weekend as part of the M6 link road works in Lancaster.
Sections of the new Folly Railway Bridge have already been delivered to the Costain construction site off Barley Cop Lane.
The eight deliveries, each 21 metres long, arrived by road over two nights after 11pm to avoid peak traffic.
Work is well underway to weld the sections together so that they form four pairs of beams 42 metres in length.
They will then be dressed with permanent formwork on the ground to make a lift weight of 157 tonnes.
The work to lift the sections into place will take place tomorrow, Saturday November 22, and Saturday 29, subject to weather conditions.
Engineers will be on site from 8pm on the Saturdays to 8am on the Sunday mornings, to oversee the operations.
A crane capable of lifting 250 tonnes has arrived on site to lift the bridge sections in over the vacant west-coast railway line.
Costain project director, Andrew Langley said: “I’d like to thank the residents of Barley Cop Lane for their co-operation in allowing us to get these extremely large sections delivered to site without any notable problems.
“Barley Cop Lane was the only available route and residents rallied to keep one side of the road clear for the oversized vehicles carrying the sections.”
Costain will set up a viewing area for interested parties to the south of the bridge and east of the railway line, just off Barley Cop Lane.
Observers are welcome to come see the operations on the night.