The diggers will be positioned underground so tunnelling work can be carried out immediately if ministers approve continuing construction.
HS2 project manager for Old Oak Common, Huw Edwards, said once that station is built, it will be too late to put the diggers into the ground, as new tracks are to be built above them.
"We cannot wait, otherwise we would not be able to open the widened conventional station," Mr Edwards added.The two boring machines will be named and blessed in a Christian ceremony - with a statue of St Barbara, the patron saint of tunnelling, before they are lowered into a deep chamber next year and covered over to await their potential dig towards Euston.
The HS2 project has been beset with spiralling costs and delays and trains are now not expected to run to Euston until 2041 at the earliest.
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