Rails - Mar 2006 - Setting up apache as a proxy without subdomain

I want to run an Apache webserver that acts as a local proxy for multiple
rails instances in the same domain. The domain seems to be a problem: which
directives can I use for  www.somehost.com/one and www.somehost.com/two if
they are two different rails setups?
I came up with this but that does not work:
<VirtualHost somedomain.com:80>
    ServerAdmin                 webmaster@username.tld
        ServerName              somedomain.com:80
        ProxyRequests           Off
        ProxyPreserveHost       On
        RewriteEngine           On
        RewriteRule             ^/one/(.*) http://127.0.0.1:3000/$1 [P,L]
        ProxyPassReverse        / http://127.0.0.1:3000/
</VirtualHost>

The wiki does not mention this case either.

Bart