New ideas are not easily accepted by everyone and creating a plan of introduction may help you start the process. Here are a few basic steps to introduce Rails:

Highlight the interesting points and advantages of using the Rails technology.
Know your audience. Be aware of what they need and how Rails could meet them.
Explain how Rails differ from other technologies that are in competition with it.
Discuss real applications made with Rails, its development and performance and the system requirements.
Don’t just talk about it, show a screencasts about it.
Demonstrate how to use the Ruby technology, showing them how easy it is to use.