As I had already attended the year before, I didn't feel the need to take a second set of photos of the same subjects. Also more parts of the shoppes were closed off than the year before which reduced the variety of photographic subjects in general. However I did make an effort to get some better quality photos of some of the technical displays. You can see all of the 2011 Rodeo Photos here.
First up is a Silverliner IV gearbox and drive assembly fresh from being rebuilt. The electric motor would be mounted to the exposed gear on the left and each truck would have two of these gearbox assemblies, one for each axle. Oh, don't let that small hole fool you as that is not actually one of those "unsafe" hollow axles.
Here we see a variety of Silverliner gearboxes returning from being rebuilt. The ones with the flat tops are for Silverliner II's and III's.
Exploded view of an SL-IV gearbox.
MFL M-4 car drive assembly with the wheels mounted. The Fern Rock shoppes handles the heavy gearbox overhaul work for all of SEPTA's rail fleets with the axle sets being trucked to the line specific maintenance areas.
M-4 gearbox exploded.
MFL M-4 car disc brake units both refurbished and unrefurbished.
BSS B-4 car tread brake unit that attaches to the units' GSI-70 trucks.
No this is not one of those suitcases used to arm nuclear missiles for launch. It is a test unit for the old GE supplied cam motor controllers for the BSS B-IV cars as they were originally delivered in 1980. Since the last Rodeo SEPTA completed its $11 million upgrade from cam DC controllers to IGBT chopper controllers, but the old test equipment was kept on for display purposes.
View of the cam controller showing the high voltage contactors and their associated arc chutes.
The smaller cam unit for the control circuitry.