We arrive in Beijing (T3) at 12.15pm on a Friday and need to transfer to Tianjin the same afternoon. Wheelchair Accessible Tranfers available?

We are travelling with an adult in a wheelchair. We were planning to take a bullet train from South BJ Station. Can you tell me if the Airport Express and Bullet Trains are wheelchair accessible or the best way to get 5 adults (including the wheelchair)from the Airport to Tianjin.

Also we need to know the best way to get from the Renaissance Downtown Tianjin to the Cruise Treminal on Saturday morning.