The point of my post was not really about how much the SA battery can supply,
but OK I'll bite.
Although the stated aim of the Horndale Power Reserve ( the correct name) was in part to cover the low tines for wind/solar it has already done much much more.
In November/December ( even before the official switch on), the Loy Yang A unit (stable coal NOT) tripped at least 5 times.
This sent the entire South East Australia into a tail spin (frequency drop). https://reneweconomy.com.au/tesla-big-battery-outsmarts-lumbering-coal-units-after-loy-yang-trips-70003/
For about 5 seconds, the battery facility held NSW, VIC, SA together, until the contracted Gladstone(QLD) coal generator could fire up and get the network back to normal. Not a bad effort for "a small town on its own". And that was only about 7% of it's potential output.
NB "seconds" doesn't sound much, but it is a big deal in the elctricity market
The point about a battery powered train is how many of those refrigerator sized power packs would you need to power an X'trapolis for the round trip Frankston to Stoney Point. Maybe 6 that's a doddle - 60 forget it.
Never know until the maths is done - any elec engineers out there with the base info of a train power consumption?
1 Tesla power pack = 210 kWh, AC .