You gotta love my engineers. Talk about an enterprising group of individuals. This is a CLASSIC.
Sent to me by Irving Cherney, 540th Combat Engineer. That's him and his sidekick babe, Annie.
HA!! She doesn't look like she is 280mm to me! 
Ha-ha, a really good one Steve. No, looks rather petite to me too! 
The BIG German guns were hard to find when they first went into action because they would roll them in and out of a RR tunnel ! With a range of 38 miles they could hit anything on the front line.
Traversing them was THE problem. 2 degrees horizontall movement is the stats on them. SO they used a curve in the RR tracks to aim them lft and righrt.
Have a look http://www.diggerhistory.info/pages-weapon...anzio_annie.htm
IN S. France I watched a dud spin end over end after it hit at to low an angle, It reminded me of a kitchen stove range boiler. 12"x60" flippinmg thru the sky. It is probably still there. UXB !