Talk:Double shelf coupler

Clarification needed.
Which coupler has double shelves, AAR Type F or AAR TypeE? Peter Horn User talk 21:48, 6 May 2018 (UTC)
 * See also Tank car Peter Horn User talk 21:53, 6 May 2018 (UTC)
 * TypeF coupler, this will help Peter Horn User talk 01:25, 7 May 2018 (UTC)
 * And these  Peter Horn User talk 01:42, 7 May 2018 (UTC)