Streamlined Slanted Cupola Caboose Drawings (1950s-1960s)

I am looking for anyone who might have access to drawings of modern slanted cupola steel cabooses, such as the X series that Great Northern had in the late 1950s thru 1970. I have seen photo images, but have had no luck locating drawings of this late version of a caboose. I believe Bachman had an HO model out in the early 2000s. If anyone knows where I can obtain prototype drawings or has access to a late Car Builders Cyclopedia book or an old MR magazine where this might be copied from, please let me know. Email me directly at brillparacas@tampabay.rr.com

Thanks in advance for any responses.

Might try the Great Northern Historical Society. They have a lot of stuff there. If you are into the GN the society is well worth joining.

As to the Bachmann slanted cupola caboose. It is a very good model of a Chicago Burlington & Quincy NE12 caboose. These models do require some work to make a good caboose but the body is very good. The floor/underframe needs attention though.

The couplers are talgo mount horny-hooks and weight needs to be added and the tool box(?) removed.

The Bachmann caboose is available in Santa Fe, Union Pacific and I tink Conrail. None of these roads had any cabooses that even resemble the model.