Sigma Cinema camera
That would be cool but I have proffered before that a 1.5 cropped sized sensor set with a 2X 1080P resolution with and bonus on vertical to fill out 3:2 DSLR aspect.
This would give a 9.7MP still resolution that is more than enough for most folks. Plus would allow for 4:1 pixel binning for awesome SNR for 1080P video.
A bad day of train chasing is better than a good day at work.