I have one set of like new sprung Athearn Bettendorf metal trucks that are excess to my needs (their deep flanges bounce through my code 148/125 cast frogs on my 2 rail layout). Athearn metal wheels have deeper flanges than their later production plastic trucks. These may be a suitable compromise flange depth for some 3 rail layouts. If interested contact me using the email address listed in my profile. The price will be attractive.
Ed Rappe