This reply should probably link to the ON30 discussion,

As you all suggested, I did some Internet shopping and found several good hits.  Both San Juan(plastic) and Wiseman(metal) offer turnbuckles and/or clevises.  Wisemen offers railing stanchions that cad be adapted for the truss standoffs.  Wiseman also offers railing replacements, specifically for the Bachmann Overton cars, as will as an upgrade kit with lots of parts.

Bachmann offers a Freight Car Underframe in black(29906) or rust(29907) though scaled for 25.5' not 35'. It's not quite the same as the passenger cars but could be kit bashed in a pinch.  Its not a bad deal as you get three underframes(no trucks or wheels) with EZmateII couplers. 

You would think with all the on30 Bachmann Overton cars out there, specially the Bradford Exchange models, that Bachmann would offer a parts line to support the passanger cars. Bradford offers nothing and while Bachmann supports mostly the locos and trucks for the basic Overton car, it makes no mention of the Bradford models and the unique parts for them.   All of which are made by Bachmann.

San Juan Car Co.
turnbuckles and clevises
http://www.sanjuancarco.com/on30-parts-and-miscellaneous/

Wiseman Model Services
Upgrade kit
http://www.locopainter.com/store/product.php?id=1381
End beam and railing
http://www.locopainter.com/store/product.php?id=1382

Bachmann Trains
Underframe kit black
https://shop.bachmanntrains.com/index.php?main_page=product_info&cPath=487_490&products_id=5157&zenid=e17itsiqgdnq3dvdl1h7f0cah5

Underframe Kit rust
https://shop.bachmanntrains.com/index.php?main_page=product_info&cPath=487_490&products_id=5158&zenid=e17itsiqgdnq3dvdl1h7f0cah5

My experience with the Overton cars is that they regularly break in 3 areas.  The truss when you pick them up and your thumb hits the truss.  The end railing and specially the brake wheel when packing.

I call them Overton cars out of habit.  I know that few of the 34' passanger cars were actually made and were used almost exclussively on the Sierra RR.

How do you model the turnbuckles?  I have several damaged truss rods on On30 passanger cars.

The older set had EMD F9A powered and F9B unpowered.  The 3 passenger cars are the modern Vista View.  Since Alaska Railroad has discontinued the F9's, the set from Bachmann now has an EMD GP40 with the same passenger cars and the newer controller.

I would get the Thunder Valley set has it gives you more flexibility for layout and operation.  You can add different cars for different operations.

It would be nice if someone (HINT HINT BACH MAN) would create a table for each eztrack curve product showing the arc as well as the radius for each section.  In the catalog the 11.25" and 19" products have a note showing how many sections to create a half and quarter circle respectively.  From that information one can determine that the arc each section is 30 deg and 15 deg respectively.  How about for the other radii?

I bought the Golden Spike #23131 at a really good price to try DCC.  The layout is an oval with a single manual turnout.  The straight sections (5) are all 5 inch but the straight section of the turnout is 6.25 inches.  How does one form the oval missing 1.25 inches of track?  Shouldn't Bachmann have included that short section?

I've recently purchased several 44861 and 44862 EZ trak turnouts and noticed 2 different designs.  Does anyone know when the design change was effected and why?  Is one better tan the other?  which is preferred?  One difference is that the end of the divergent point on one model is all metal and on the second model it's plastic.
Ralph

1. Green wire from turnout with 3 pin plug goes into the top of the Turnout Directional Switch.
2. Red wire with 2 pin plug goes into the side of the Terminal Direction Switch and the spades are connected to the Accessory 16v AC terminals on the Comntroller.  The second switch can be connected directly to the side of the first switch to get ac power.
3. I don't think there is a hot and cold side as in dc.  However, there is a common for the AC at the turnout and it's the middle pin.  You'll have to take a multimeter to see which direction the Direction Switch controls which direction the turnout switches.  If it's opposite from what you want, just flip over the green wire plug at the direction switch.
4. Don't have Bachmann specific answer for this queston, but I've seen layouts using 20 gauge wire.
Ralph

The Classic Collector Series included 5 19th century trains that were released in the 1980's.  The Dewitt Clinton, the Lafayette, the Pegasus, the John Bull and the Prussia all with 140-xxx model numbers.  It appears that several of these were re-released in the 2000's with 006xx model numbers and were upgraded with the newer transformer and NS EZ-track.  Were there other changes?  Were all 5 re-released?  Is there any documentation on this series other than what's on the boxes and in the catalogs?