Brake Hoses that really attach - anyone try this?

I was wondering the other day if anyone has made some air hoses that really attach between cars?  It seems like it would not be that hard but I haven't seen any manufacturers do this so maybe it is harder than I'm thinking or not worth the effort?  For folks that have automated coupling/uncoupling I image this would be difficult and not even desireable.  But when I hook up a train and run it I usually run it for a while.  For close up pics of a train it looks strange for the air hoses not to be connected.

What are your thoughts?