Disney has announced that they will be adding a new train this fall. This will bring the total number of trains in their fleet back up to 12. They have not had 12 trains since the deadly crash back in 2009 where a monorail pilot was killed when 2 trains colided.
The train will be tested in the next few weeks, without the stripe. The stripe will be added once everything checks out and they know the train operates correctly.
Hopefully this will help ease some of the delays on the monorail system. On our last trip DH and I had more issues with the monorail than any other form of transportation. This announcement comes a few weeks after Disney announced the change in monorail service during Extra Magic Hours.