the new train sets will be able to couple two sets together to make one, or remove 2 power cars and couple between sets, or remove at the articulated joints and expand with more cars. There are a lot of options here, from every day ones to future expansion ones. The current sets cannot be connected together and operated as a normal train. The new sets will be able to be plugged right in to each other without any mechanical dept help or man on the ground which will be a huge advantage for broke down trains or late equipment, combining it to keep stuff moving and on time.
No good deed goes unpunished.