The DY-100 Class Transport from Star Trek: The Original Series episode "Space Seed", this is the type of vessel that transported Khan Noonian Singh and his followers away from Earth at the end of the Eugenics War, in 1996.
Not all my own work, the DY-100 cutaway (like the Type F Shuttlecraft) is a merger completed by myself of a full cutaway and full side view (originally done by Kevin Willcocks) to bring it in line with the Star Trek: Fact Files illustrations.
UPDATE: Revised background, use Download to view full size.
Credits: Original Artwork: Kevin Willcocks Background: Heavily modified by myself from the SFC3 "Vessel Library" background.
Disclaimer: Star Trek is a registered trademark of Paramount Pictures - no copyright infringement is intended.
Sadly it would make the image too small! I originally did this about 3 years ago when I was using a 1024x768 CRT monitor, I chose the large size for quality