How create new Rails with old version?

Been googling, can't find an answer....

I have 1.2.6 installed (part of OS X Leopard), and I have installed
2.3.2.

Running the two versions using the config environment.rb I get, freezing
I get.

I have some legacy 1.2.6 apps, and I'm wondering how I generate a new
1.2.6 project since the rails command is now mapped to the 2.3.2
installation.

THx.

-- gw

rails _1.2.6_ projectname