OK. Some pictures.
First up is a test shot of of DPH/SSA's Thrall gondola. This is a truly a contemporary car. As far as I know it's only available as a kit:
Here's the DPH/SSA 3-bay coal hopper. I seem to recall it's based on the Pennsy H39 and a tad south of what can be considered "modern" from the 2017 perspective.
Finally, the AM tank cars. Also a little long in the tooth to be considered "modern," but outside of locating some elusive Downs or Iron Rail (both out of business) tank cars, they're the most modern tank cars readily available:
I admit I'm late to the modern game, so my overall knowledge is minimal. If the SD70's ad ES44's hadn't come out, I'd still be fat dumb and happy modeling the mid-late 1950's.
Rusty