Fig wrote:
I often use the FGW service out of Paddington and notice Eurostar
trains in a shed south of the line somewhere near Acton. Simple
question - how do they get there? Seems a long way from either
Waterloo or PGduN.

They run from Waterloo, via the Sheepcote Lane chord, to Kensington Olympia
and then on up the West London line to their depot at North Pole, which is
the depot that you see adjacent to the Great Western Main Line. In due
course this depot is closing and the Eurostar maintenance transferred to a
new replacement depot at Temple Mills, near Stratford, in East London.