Now that we're running semi-modern apis in all projects, it should be possible to upgrade our Horizon deploy by quite a bit.
Train/Horizon is now running on cloudweb2001-dev and seems to work fine. We can probably go ahead and deploy this after we upgrade to Ocata in eqiad1.
For better or worse, the Train release of Horizon is not dramatically different from Ocata. It has a few prettier widgets and (probably) support for lots of services that we don't use. It also feels a bit faster.