From CST take Karjath local to Neral. At Neral there is no advance reservation for Toy Train. One have to be in Q and ticket will start issue 45 minutes before train departure on first-come-first basis. If you take early morning local from CSTM to Neral and from Neral to Matheran by Toy train and back to CSTM is possible with limited sight seeing at Matheran the same day.