Multi-unit railroad car and railroad car trucks therefor

A multi-unit articulated railroad freight car comprising:

• a set of articulated car body units, said set of articulated car body units being carried upon a symmetrical arrangement of three-piece railroad car trucks;
• said set of articulated car body units including first, second and third car body units, said first car body unit being a first end unit of said multi-unit articulated railroad freight car;
• said second car body unit being an intermediate unit of said freight car;
• said third body unit being a second end unit of said freight car;
• said first car body unit having a first end and a second end;
• said first end of said first car body unit being connected to said second car body unit at a first shared truck;
• said second end of said first car body unit being distant from said first shared truck;
• and said second end of said first car body unit having a coupler operable to connect said multi-unit articulated railroad freight car to another freight car;
• said second end of said first car body unit being carried on a first end truck;
• said first shared truck having first and second spring groups;
• said first shared truck having first and second four-cornered damper groups;
• said first shared truck having rolling point contact rockers mounted at respective side frame to bearing adapter interfaces operable to permit said first shared truck to self-steer;
• said first end truck having first and second spring groups;
• said first end truck having first and second four-cornered damper groups;
• said first end truck having rolling point contact rockers mounted at respective side frame to bearing adapter interfaces operable to permit said first end truck to self-steer;
• said rolling point contact rockers of said shared truck having a first radius of curvature;
• said rolling point contact rockers of said end truck having a second radius of curvature;
• and
• said first radius of curvature being larger than said second radius of curvature.