MK WDW Railroad accessible train car

The front car of the train is accessible with a built in ramp that is let down to allow a wheelchair to roll on. There is space for about 2-3 wheelchairs, but only one rear facing bench for other guests. There is something (trach can, rail, etc) at each station to keep other guests from getting onto this car, so anyone who comes up the ramp into this area can't get 'out' to get onto another train car. Because of this, only a small group should accompany the guest with a disability to get onto the train.