Final preparations are under way for the first major milestone in an £850m overhaul of Reading railway station.
Network Rail is remodelling the station by 2013 to include five more platforms and two additional entrances.
A new viaduct will also be built to the west of the station to boost capacity and cut delays.
A new 1,000-tonne railway bridge will be installed over Caversham Road during the New Year period. It will carry railway track to new platforms.
Mark Hepburn, of construction engineers Bam Nuttall, said: "It's a big load, it's 45m wide and 17m in spine and weighs over 1,000 tonnes.
"It's moved by a multi-wheeled trailer that looks like something that's come out of Thunderbird 2 really, a big piece of kit."
Major signalling work has already been announced at the station over the Christmas period, meaning no trains between 27 and 30 December and a reduced service on 1 and 2 January.
Caversham Road will be closed from the evening of 30 December to the morning of 3 January while the bridge is lifted into place.
It is hoped the station and road will reopen on 4 January, the first working day of 2011.
Work to reorganise traffic flows and road layouts around Reading town centre ahead of the project began in June.