No. I have conflicting and incomplete records but the breakdown is roughly two T/Bird SP's, three Wash 208's, one Wash 158, eighteen Skajit SP's and eleven Skajit trailers - thirty five in total. Have no info on Y9055 or Y9068.
I have all the build lists, serial numbers, specs, (including many blueprints) etc from the Ross Corporation archives in my personal collection- right down to every grapple and carriage they built. The miserable part of that is that it's all in paper form (several big, big binders) and scanning the volumes is quite literally a boring nightmare... Eventually I will get it done and then the fellows can convert it to spreadsheets like they've done with the other records for easy searching.
There were originally really 3 (late 1970's- era) machines that formed the foundation of Ross's 'Thunderbird Yarder Line':
1. The TMY-45 mobile/mini yarder, built by Chapman Industries in several different configurations
2. The PSY-200 swing-yarder, built by Pierce in Portland, Oregon in several different configurations
3. The PTY-400 slackline yarder with 110' crawler-mounted telescoping tower, built by Pierce in Portland, Oregon. All came to Alaska.
The PTY-400 was a monster machine (hoist/drumset larger than a Skagit 739 winchset) and mounted on a tower/carrier with extended Caterpillar 245 hyd track frames. As everyone knows drum sizes/capacities on the Thunderbird TY-90 are closer to the Skagit BU-737 slackline winchset than anything else...
Later, in the mid-1980's, when Ross built thier 2 TT-90 sp towers, the tower/fairlead design was a similar to the PTY-400.
Many people dont realize that the Thunderbird TY-90 was sold as a hoist-only and with no carrier or tower. Skagit T-100 was the most common choice as a mounting, BUT several T-90 and T-110 applications were used as well. The Thunderbird TT-90 was a more expensive tower/carrier option, but ony 2 were ever built and sold.
Here are some old (poor scans) advertising pics from 1989 when TY-90 Y-9040 was still on it's Berger 110' Self-Propelled tower/carrier.
Ober Logging of Carson, Washington ordered this setup, as they already had several other Berger yowers and liked the Berger option best.
I have a batch of my own pictures of this machine but they are at home in Washington and I am in Alaska right now as I live here much of the year.
Roadswitcher: To answer your question regarding the missing Serial Numbers (9055 and 9068), these numbers were used on the 2 Thunderbird TT-90 tower/carrier sets:
Tower/Carrier Serial Number T-9055 (a TT-90 SP) was sold new to Hopkes Logging and had Y-9051 hoist mounted on it
Tower/Carrier Serial Number T-9068 (a TT-90 SP) was sold new to Papac Logging and had Y-9050 hoist mounted on it.
Also: Y-9040 was removed from the Berger and installed on a Skagit T-100 SP for Nygaard in 1993.
I have found that there is a constant stream of TY-90 pics/info on Facebook, as many are still working daily around the PNW.
I sure hope this helps!