Where's the thread for requesting new rolling stock?

I want a cp rail maroon complete "the canadian" budd set from one of the amtrack sets, an alco s2, a cn dash9 blue devil,and a cp rs3

 I will second the request for the 5161 hopper.  And it's an attractive car for a mfg to do for a number of reasons...mostly the fact that there are many prominent schemes from the major Class 1's (especially if you bend the rules with some of the newer similar hoppers) and secondly the fact that they ran often as unit trains so that tends to bolster sales as well.

My other wants (for newly tooled items) branch a little from yours.
1. Trinity 5161cf Covered Hopper
2. Thrall 52ft6in Gondola - I think these are one of the most needed cars in Z.  I include with this the corrugated panel versions as well.  The blueprint for this would be what Trainworx did in N.  The RailGon car like Athearn does in N would also be an option.
3. Any number of "modern" (build date post 1970ish) tank cars.  Not referring to the ultra-modern Ethanol/Crude cars but anything up to that point.
4. Ethanol tank cars.
5. Echo the Geeps that Johnathan mentioned, but would add a plastic C44-9W and ES44DC's.   I'll throw out SD70MAC's as a personal favorite but realize that's a longshot.  Would also love a "Santa Fe'd" GP7...flat short nose.   You'd be surprised how many of those there are in the wild.  ;-)

For existing tooling, there are a lot of schemes I would love to see.
1. Bethgons - First and foremost would be the TGNX cars that complement your PNJX cars and are an anchor for coal traffic on the line I model.   But the big commercial success has to be the silver/green BN which I believe is far and away the largest in existence on the real railroads.    But also want various other BNSF schemes too...there are at least three that you have not produced yet. These include the "Cooper Block" BNSF, Circle Logo with Mineral Red ends, (similar to your BNSF green cars but with mineral red ends) Circle Logo with smaller mineral red ends, (similar to your BNSF Swoosh cars but with circle logo)
2. Beer Cars - Newer ATSF Schemes, the older BNSF scheme, and the Cryo-Trans scheme are all of interest.
3. PS2-CD - Still dozens of great schemes that need to be done. 
4. Syrup Cars - Tate & Lyle / Staley
5. Locos...BN Whiteface GP30, TRE RDC's

While I am blowing out the candles (all 72 of them?) on my birthday cake I am once again wishing specifically for a GP40/-2,GP50 or a GP60 in the same lower priced category as the GP 38-2.AZL has a proven chassis and the handrails what is needed is the body casting.

Hey, it's my birthday I can wish if I want.