Railgun is a wide area network (WAN) optimization technology. Unlike plain CloudFlare, Railgun uses alternative compression techniques to speed up the performance of non-cached site pages and ensures that the connection between our web server and the CloudFlare CDN is as fast as possible.
1. Login to your cPanel account and under Software click CloudFlare
2. Follow the instructions and sign up for CloudFlare
3. On the Home tab you will be able to see Railgun™ option
4. Just click On and you railgun will be enabled for your domain
Please contact support if you have any questions.