But if they went with Millennium Flyers, the capacity would suffer.  I think they max out at twelve cars, which would be 24 riders per train.  Currently Beast has 36 people per train.  That is a pretty significant reduction in capacity.

11 minutes ago, CoastersRZ said:

But if they went with Millennium Flyers, the capacity would suffer.  I think they max out at twelve cars, which would be 24 riders per train.  Currently Beast has 36 people per train.  That is a pretty significant reduction in capacity.

That's something I didn't consider. Could it be possible to add 6 more cars to make it 18? I'm no physicist it roller coaster engineer so the feasibility of this ever happening is hypothetical.

I suppose it would be possible.  Whether GCI would approve it, is another question.  I know that they did release a new version of their trains at IAAPA this year.

Keep in mind that rolling stock on coasters is very expensive.  And since PTC is still in business and providing parts, the park likely does not have a reason to replace the trains.