TSM is mainstreamed until just before you get to the steps. So wheelchairs and
ECV can go through the standby line up to the stair area. They are then sent to a ramp on the right to the handicapped boarding area There may be wheelchairs or ECV in the fastpass line but that would be either because they obtained a fastpass for the ride or they used a
DAS for other issues and waited elsewhere until their DAS time. He will go through the fastpass line but will be merged with the regular line if he can use stairs.