Anonymous sensor data shows which carriages have space before the train arrives.
Several organisations have already said they will publish their own assessments, and a cross-party committee is due to examine the proposals in the autumn session.
Supporters of the plan argue it will make day-to-day life easier for thousands of families. Critics say the costs have not been fully explained and want an independent review before work begins.
Experts interviewed for this article agreed on one point: the outcome will depend less on the headline announcement and more on how carefully the details are delivered over the coming year.
The numbers behind the decision
Figures published alongside the announcement show a steady rise over the past three years, although analysts caution that a single year of data is rarely enough to confirm a long-term trend.
The change will be introduced in stages, starting with a pilot in two districts. Results from the pilot will be reviewed before any wider rollout is approved.
This is a good start, but the real test will be the delivery.
The change will be introduced in stages, starting with a pilot in two districts. Results from the pilot will be reviewed before any wider rollout is approved.
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