Railcar truck roller bearing adapter pad systems

A roller bearing adapter pad system configured for use with a three-piece truck having AAR standard geometry comprising:

• a roller bearing adapter configured to engage a roller bearing, the roller bearing adapter comprising:
• a top surface;
• and
• a bottom surface configured to engage a roller bearing;
• an adapter pad engaged with the roller bearing adapter and configured to engage a side frame pedestal roof, the adapter pad comprising:
• a continuous top plate having a central portion, and first and second upturned regions projecting upwardly from opposite edges of the central portion;
• a continuous bottom plate having a central portion;
• a first outer elastomeric member disposed outward of the first upturned region;
• a second outer elastomeric member disposed outward of the second upturned region;
• and
• a central elastomeric member disposed between the central portion of the top and bottom plates;
• and
• wherein the combined top plate, bottom plate, and elastomeric members provide a longitudinal stiffness of at least 45,000 pounds per inch through a longitudinal displacement of the top plate relative to the bottom plate of up to 0.139 inches from a central position, and a lateral stiffness of at least 45,000 pounds per inch through a lateral displacement of the top plate relative to the bottom plate of up to 0.234 inches from the central position.