Railway truck assembly having compressible side bearings

A method of forming a side bearing assembly for a truck assembly of a rail vehicle, the method comprising:

• moveably coupling a cap to a base;
• and
• disposing one or more elastomer springs between the base and the cap,
• wherein the one or more elastomer springs comprise a foam having air pockets that are configured be compressed.

A truck assembly that is configured to travel along a track having rails, the truck assembly comprising:

• a first side frame;
• a second side frame;
• a bolster extending between the first side frame and the second side frame;
• a first wheel set coupled to the first side frame and the second side frame;
• a second wheel set coupled to the first side frame and the second side frame;
• a first side bearing assembly coupled to the bolster;
• and
• a second side bearing assembly coupled to the bolster, wherein the first side bearing assembly is mounted on a top surface of the bolster between a bolster center bowl and a first end, and wherein the second side bearing assembly is mounted on the top surface of the bolster between the bolster center bowl and a second end, wherein each of the first side bearing assembly and the second side bearing assembly comprises:
• a base;
• a cap moveably coupled to the base;
• and
• one or more elastomer springs disposed between the base and the cap,
• wherein the one or more elastomer springs comprise a foam having air pockets that are configured be compressed.