Doing the Geometry train service and I am not getting the flatcars in the consist. I am just getting passenger cars as the consist. I do have horseshoe curve installed and I have seen the flatcars show up on AI geometry trains.
The geometry train does not consist of flatcars. It's made out of their different passenger cars. Judging by pictures on the internet, it looks like there tends to be even an Amtrak car in there.