UPDATE!!
I have
changed the train to only list 100 people, due to the number of people complaining about how long it takes to add everyone before they can join. There is now a link at the bottom of the train to take you to the full list if you want to add everyone.
I have cleaned up the list to get rid of duplicates, private profiles and deleted accounts and i have a new procedure in place to catch and delete them. Please let me know if you find any!