Like the majority of modern railcars, Brightline's Siemens railcars have fixed seating, with half of the seats facing each direction. Trains are not turned. There's a locomotive at each end.
There would be environmental reports, ROW acquisition, and they would probably be required to build an elevated trackbed to avoid grade crossings. Coming up I-4 from 417 as a spur would be much less efficient operationally, but eliminate the need for additional construction, other than an additional connecting track at the 417/I-4 junction. The station could be a stub end, with the engine crew simply moving to the other end of the train and going back to 417 the way they came.
But in June 2019, Brightline presented the OUC-417-I4 route as the preferred alternative. 536 was not included.
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Source:
https://www.clickorlando.com/travel...-ground-on-high-speed-rail-system-in-orlando/