The AF SD


 AF Berkshire
Conversion to TMCC




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Here is the AF Berkshire. It comes with Lionel's Flyer Chief remote control system. It is an entry level remote with only a few options and can only run one the loco it comes with. Also you can't change it's ID number incase you need to run more than one loco of the same type.  
 



 The loco is a good looking model but to keep costs down Lionel cut some corners like using cast in handrails, cast in front coupler and many details left out like no crew figures and no backup light.
 


When removing the 4 shell screws be careful not to loose the 4 sets of insulating washer.
These are used to isolate the loco shell from the frame and are very important to keep in use.
  I squeeze the top flat washers  a bit to distort them so they will stay on the screws.

Here is where the backup light LED goes. It was used on the Polar Express  Berk but the PE loco has no coil coupler. This was a limitation due to the 4 conductors in the drawbar connector.


Here the electronics are removed and the mount for the original electronics board will be removed also.


This is the new mounting bracket for the ERR Cruise Lite board.
 

Here the Cruise Lite boards are in place with double sided tape. I changed the motor since I wanted to keep the original tach motor for spare parts. It does not need to be changed though for the conversion.  You just don't use the tach.


The chuff signal was generated by the tach flywheel in the original system and there is no place in the loco for a chuff switch which is needed for the ERR system.

It so happens the tender wheels are almost exactly one half the diameter of the drivers so a two magnet switch will generate the desired four chuffs per driver revolution.

I also added wiring to the tender trucks to supply power for the tender electronics. It is connected to the side frames with their mounting screws.



Here is the mounting bracket for the ERR railsound board. I also added a space for the 9 volt battery if you use one.
 

I came up with a circuit to multiplex the rear coupler and backup light onto one wire in the drawbar. This is the tender loco portion of the rear coupler and backup light combiner.  I designed this to eliminate the need for a loco to tender tether. It only uses the 4 drawbar conductors.  See the wiring diagram for details.
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This is the loco portion of the rear coupler and backup light combiner,

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Preliminary testing of the systems.  I also added a Puffer board that takes the chuff magnet signal and makes pulses for the Smoke motor
 

              Here is the wiring diagram.
Note the smoke element has been changed to 30 ohms to use the smoke out of the R4LC board


Video of the TMCC Berkshire

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