I've uploaded the Game Maker 7 source code for several of my trainwrecks.
http://www.glorioustrainwrecks.com/node/1830 - The Wilframs' Last Stand
http://www.glorioustrainwrecks.com/node/2146 - Rotation Invaders
http://www.glorioustrainwrecks.com/node/1818 - Solar Rain
http://www.glorioustrainwrecks.com/node/1743 - Nipples Vs Clothespegs
http://www.glorioustrainwrecks.com/node/1661 - Mario Power Paintbrush
http://www.glorioustrainwrecks.com/node/1147 - Janesaw
http://www.glorioustrainwrecks.com/node/1205 - The Great Star Fusion
http://www.glorioustrainwrecks.com/node/2263 - Bind Her!
http://www.glorioustrainwrecks.com/node/1489 - Invader Sammy in "One Sam Army"
http://www.glorioustrainwrecks.com/node/1327 - Catatoniac
http://www.glorioustrainwrecks.com/node/1842 - Trepidatious Peak
http://www.glorioustrainwrecks.com/node/1704 - Portal Two-Dimensional
http://www.glorioustrainwrecks.com/node/1363 - Flood the Chamber Again: This Time, It's Lava
http://www.glorioustrainwrecks.com/node/934 - Retro Grade
http://www.glorioustrainwrecks.com/node/1408 - Mid Morning Ride
http://www.glorioustrainwrecks.com/node/1386 - TrailblaZer
http://www.glorioustrainwrecks.com/node/1409 - Getalong Golfhop
http://www.glorioustrainwrecks.com/node/1744 - Renardes
http://www.glorioustrainwrecks.com/node/1448 - Delve Deep
http://www.glorioustrainwrecks.com/node/1378 - Unshrinker
http://www.glorioustrainwrecks.com/node/1773 - Daddy I'm Scared
Note: if you're using these in GameMaker: Studio free version, you may have to delete the "draw_self" script if it's present in one of these codebases. Since draw_self() was added as a standard feature in later GM versions, the script is no longer necessary.