I wanted to share some information regarding the black plastic O scale handrail stanchions that apparently are no longer available on the Bachmann website.  I have an older Williams SD45 that has wire handrails and black plastic handrail stanchions.  Due to age, several of the stanchions tabs that fit into the stanchion holes on the engine shell have broken off.  I have looked at length for replacements, without success, online on Ebay and on Google.  No luck.  Today, I came up with a replacement.  Although not an exact replacement, I took several of my daughter's black wire hairpins, cutting them in half with a channel lock.  Once the hair pin was separated into two pieces, I measured the handrail length and took a vice grip and cut it to length.  I than formed a loop on one end to fit onto the wire handrail, and bent the other end so the hairpin took on the shape of the letter "L".  The shorter length of the "L" is short enough, and the correct diameter to fit perfectly into the factory pre-drilled stanchion hole in the engine shell.

I hope that this information is useful to others who enjoy collecting and operating older Williams engines as much as I do.

I checked in my Williams catalog library, and this is what I found:

The UP Gray Madison set SM301 was offered in the Fall 2000-Winter 2001 catalog. It was only offered as a 4 car set.  I saw no option for add-on cars. I also checked my 2008 and 2009 catalogs, and saw no information regarding this set.

In these same catalogs, I also looked for the UP Streamliner set you referenced.  I don't find the 85110 number.  What I did find was this in the 2008 and 2009 catalogs:

Item # 43163: 4 car set (1 baggage, 2 coaches, 1 observation)  These are 72 foot streamline
Item # 43113: 2 car add on (2 coaches)

In the Fall 2000-Winter 2001 catalog:

Item #STR4016 (Union Pacific 72 foot Streamliner)- 5 car set (1 baggage, 2 coaches, 1 vista dome, and 1 observation
No additional cars offered for Union Pacific. 

Hope this helps you.  Good luck in the search!

Thank you for the information.  Since posting my question, I found some windshields on Ebay using Lionel in my search.

I am looking for ornamental horns, headlight lens, headlights, number boards, 5-chime horns, handrails, and handrail stanchions (short and long) for SD45's that I recently finished painting.  No availability for any of these parts on the Bachmann website.  Any suggestions on where to find them?  No luck in researching on Ebay.

I am trying to locate the mounting screws for attaching the rear steps to the chassis of an O scale Baldwin Sharknose A unit.  Due to my carelessness, the missing screw is impossible to find in my train room.  Attempts to find a compatible screw at a hardware store/big box store has been futile.  Any suggestions would be welcome on where to find them?

I purchased a dummy Williams PA-1, with the intent to upgrade it to a powered unit.  It appears to be an early Williams product.  Are there still available dummy upgrade kits available for older units, like this? If so, from where?  I have had no luck locating anything on Ebay.  If available, are dummy upgrade kits compatible for other 6 wheel Williams products (SD45, SD90)?

I am interested in running multiple powered Williams SD90's in tandem.  Using a Lionel ZW transformer.  Any suggestions?