 The cars were accessed by doors which were automatically opened using a pneumatic system (a loud clunk would be heard and the doors would swing open at the press of a control button on the outside of the monorail near the driver door) and manually closed by a Cast Member who would walk from one end of the train to the other with his hand out, pushing the doors shut as he walked by).Unlike the current Mark VI trains in use at Disney World, Mark IV's were shorter, the cabins were somewhat narrower, and had no standing room capability.The trains were equipped with air conditioning and heating, and each window could be cracked open with a latch.