Autorack railroad car having convertible deck structure

An autorack railroad car, comprising:

• a first height-adjustable deck and a second height-adjustable deck;
• said second height-adjustable deck overlying said first height-adjustable deck;
• an height adjustment drive transmission having
• a first array of threaded output shafts mounted to drive motion of the first height-adjustable deck;
• and
• a second array of threaded output shafts mounted to drive motion of the second height-adjustable deck;
• and
• said threaded output shafts of said first array are of opposite hand to said threaded output shafts of said second array.

A roller-mounted adjustable-height deck for an autorack railroad car, said deck comprising:

• a decking array extending cross-wise between first and second lengthwise extending margins, there being deck carriages spaced along said lengthwise extending margins, said carriages having rollers mounted thereto;
• first and second lengthwise extending side beams running along said first and second margins, each of said first and second side beams having a first leg underlying said decking array, and a second leg defining a vertical leg extending away from said first leg to form an angle;
• and
• said decking array having a raised central crown, and a vertical height rise measured from said margins thereof to said crown;
• and said vertical leg has a greater vertical extent than said vertical height rise.