How do i take the shell off an Atlas s-2 Roco made?

Hi, I forgot how to remove the shell from a ho roco made Atlas s-2. What is the little trick?

Try this link,

http://www.atlasrr.com/Support/locoshell.htm#hos1

Glenn

Possibly this link from the HOSeeker site might be helpful as it seems to show the latches referenced in the above link: http://hoseeker.org/assemblyexplosionAtlas/Assembly%20Explosion%20Atlas%20S2%20S4%20version%201.jpg

Thank you!