WRM recently received a truck from BART. The truck was sourced from a recently retired and scrapped B2 car.
The truck itself is an original Rockwell model HPD-3 inboard bearing, cast steel truck, designed and used by BART’s A and B cars, and later refurbished and used on the A2 and B2 cars. The image below shows various components of the truck as originally built.
Compare to below
This particular truck, serial #2368 has a build date of 1970 as seen by the builder’s plate.
During the midlife refurbishment of the A and B cars into the A2 and B2 cars in the late 1990s and 2000s, these Rockwell trucks were refurbished and replaced their Westinghouse 1463 DC motors with Adtranz 1507C AC motors.
The third rail shoe and related assembly (in red, stored on top at the moment) picks up 1000 volt DC third rail and feeds it to the propulsion system (inverter) located underneath the carbody. Then, AC power and commands from the car powers the two motors, moving the truck (and the car mounted on the truck).
Overall, the truck is in excellent condition and with a few more parts, will be a complete B2 car truck. This truck will help the BART car preservation effort by providing numerous measurements to ensure safe movement and storage of three BART legacy cars in WRM’s Carbarn 3.
"The Two Bagger" is meant to be a place to store more "blog" style posts on various cars, pictures, and random tidbits. At BART, a "two bagger" is a rather informal name for a two car train. Two car trains rolled in revenue service back in 1972.