The NB2 Locomotive
The coupler height was lowered by 5/8" by removing 5/16" from the top and bottom surfaces of the equalizer bars where they cradle on the coupler tube and the truck sideframes. This required that the side plates and plow mounts be redrilled to their new positions.
Previously, the horn and bell were mounted inside the locomotive shell. There is really not enough room there, so both were moved to the chassis in the unused battery bay.
Because the bell and horn assemblies were relocated, it was necessary to change the wiring harness between the shell and chassis. At the same time, the connectors were relocated to make them easy to connect once the shell is in place.
Control panel changes include addition of six status lamps and the trainline switch and fuse. Status lamps tell what mode the locomotive is in and report any faults detected.
The other switches on this panel are Forward/Reverse, Brake/Release, and the 100 amp main power switch.
This photo shows a much larger reduction sprocket than in older photos. (60 teeth versus 35). This makes the locomotive half as fast, but it can pull twice as much. Sorry kids. It's not the rocket it used to be.
Also notice that the controller is now mounted heat sink side up instead of on one side as in earlier photos. This is because that is the only way I could make it fit under the shell after raising the drive train to accomodate the larger sprocket.
I needed an easy way to update the NB2's firmware. Each time, I had to recompile the FPGA code, remove the controller box from the locomotive, remove the FPGA board cover, plug in the Altera USB Blaster, and reflash the configuration device.
So I added this SD card. Now all I need to do is put the new firmware on the SD card and plug it in to a slot in the underside of the controller box.
I also added this quick release battery strap. That battery weighs 38 pounds. It's a lot easier to move the engine on or off the track without it.