new layout with no name

[long island jack]

Thanks all for the imput so far,here's a list of the c/hoppers i have.

PWRS ACF 4600 3-bay c/hopper,UP x3
Intermountian 4-bay cylindrical c/hopper,NHAX x2
Atlas ACF 3-bay cylindrical c/hopper, CSXT x2
Exactrail Evans 4780 c/hopper, FMC Chemicals x1
Athearn 54' 4700 c/hopper, FMC X1
Atlas ACF 4650 3-bay c/hopper, SSW x1
Walthers 50' airslide c/hopper, CSXT x2
Walthers Trinity 100t 2-bay c/hoppers, CSXT x2

would all of these still be in use in the period i plan to model 1990-2000??,if not could you give me some examples of c/hoppers that would be.
Ray