It does look like a =very= red Dracaena marginata cultivar. I was thinking 'Colorama' which is much redder than 'Tricolor'. This plant is much too red for 'Tricolor', maybe even too red for 'Colorama'. But as has already been mentioned, amount of sun can make a difference, also nutrition (e.g. iron can bring out red coloration in some plants).
Another possibility is Cordyline australis, as in Cordyline australis 'Electric Pink'
http://www.plantify.co.uk/Cord...
or Cordyline australis 'Sunrise'
http://ocsucculents.com/highli...
http://www.smgrowers.com/produ...
Growth habit seems more D. marginata, but I don't know. All I really know is I like it!
Could you lop off maybe a one-foot section and send it to me? I might then be able to give you a better ID.
