We're planning a trip from LCH to GSC. I would like to pay for a roomette from LCH to ELP (1 zone) then use AGR from ELP to GSC for a bedroom. We won't be getting off in ELP and just changing trains in LAX and EMY. we will ride the bus from DEN to RAT and catch the SWC back to LAX, then home on the SL. Is all of this possible?