So now you are objecting to what is effectively a new railway being electrified ? What are your viewa on the means of propulsion for HS2 ?
Though East-West Rail isn't entirely a new railway, it's joining together various other bits of railway that aren't all electrified. So you're back to deciding whether the additional costs of putting up the wiring (reduced by not being a live railway) are outweighed by the costs of running a Diesel over the usual lifespan of such things.
Whereas for HS2 most bits of the conventional network it will be joined to are already electrified at 25kV and it will be getting a much more intensive service that tilts the balance towards spending CAPEX to avoid OPEX. Plus there aren't any diesels available that can do 360km/hour.