First-and-last mile delivery need the flexibility of trucks, there's no way around it. So an expanded railway system and electric trucks are the way to go I believe.
When travelling on our highway (e-45) I see many trucks which are not first/last mile but more likely in the 1000 km range. I think that we should consider smaller trains which cost more to establish but could use some of the power getting wasted (wind/solar) at times where it is generated but the demand is low.
The only country that I’m aware of that did both great on the same network was China, but they ran into capacity issues so they spent hundreds of billions to move people onto a brand new dedicated passenger high speed rail network and now the legacy slow one has more room for freight.