Not sure if my input will help regarding commuting for school.
Sorry for being long winded.
Both Daughters have travelled for school since reception class.
We travel in from SE London to Charing Cross and then on from there.
we catch an early train to allows an hour to get to school. When they were younger school didn't open until 8.30 so we would go to Leon's on route for porridge etc (No breakfast club at school) I'd then drop off DD1 and carry on to work. Then by time DD2 started Husband was also London based so we would breakfast at Leons together. Then he'd drop em off.
we moved DD2 to a new primary for start Yr4 & DD1 stayed to complete Yr6 (her choice) This meant travelling in opposite directions. So DD1 took herself to school (They now had Breakfast Club) Husband dropped DD2.
DD1 moved to Secondary Nr DD's primary so back to commuting together.
Yr 5 DD2 given permission by school to travel on her own. So both go off together via tube or bus to school.
So from this we have learnt.
Family Chat on WhatsApp is extremely helpful. We send a message when kids leave our company so other parent knows they are flying solo.
Either parent can step in to help if there is a problem eg. DD1 zip stopped working on her way home Friday.
If they have delays on Journey can very quickly let us know.
Most tube stations have wifi even on platforms.
If we have a change of plans in the evening we can leave them a message on it to pick up and acknowledge as soon as they turn phone on.
(Both ours do professional acting so last minute castings are not usual!)
Alternative routes : Make sure they know how to get to school if tube isn't running or buses being diverted.
It is far less stressful to know in advance than plan on the fly.
Safe space : Ours are both near Houses of Parliament so risks are possibly higher than most for an incident to occur. Plan for it.
Sometimes schools will get them to leave early or could be locked down.
Find somewhere you would be comfortable for them to head to if the proverbial really hits the fan.
A museum/Library/Church or cafe where they could wait for you to meet them. Hopefully never need it, but piece of mind if you do.
In all her years in primary DD1 was late once. Someone jumped in front of the train we had just missed when it got to next station.
Since Secondary - twice.
Always major train issues- last week they got to school at 9:45!
The school marked them late but with amnesty (so no punishment) as they felt they had left enough time to get in on time and circs were beyond their control.
Extreme last resort: My DD1 has high anxiety with ADD so she over thinks lots of worst case scenarios.
We took part in an active shooter survival day. It helped her to see that the scenario is not as likely as her overthinking might lead her to believe and that she already had a lot of the common sense skills needed if she were to end up in that.
I did debate for a while on if this would help or make her worse and it has helped.
Because of a central London school all her friends are around there or further out. She meets up with them all in the hols. They usually aim to meet outside of school as its central for all of them.
They will be extremely tired while they adjust to new routes. She is still in bed between 8-9 school nights so she can get up at 6 (on train by 7 in school 8)
She doesn't like it, but she is not a morning person so until she copes better with mornings we do keep an early bed and no phones in bedroom after 8.
Hope some of this helps especially if you have girls that will be travelling for first time.