On facebook it said Feel like partying with your favourite Disney character ? The "Disney Dance Express" train crosses Main Street, U.S.A., and invites guests to get down to the rhythm of Broadway. They'are all ready to bring the Disneyland Park atmosphere alive with the "Magic Movers.
Does it start and will it last until October 31st.
Yes it has already started and it is great fun.
Technically it should be still on in oct but since that it is also the Halloween season then there could be a chance it is modified to a spooky theme or even be temporarily replaced. Too early to know for sure. ;-)