Suggested Lionel motherboard by P/N for TAS EOB salvage operation

I would bet your R2lc board is fine.  EOB sensor boards had a habit of failing and going nuclear if the board lost ground.  I may have a spare one for sale if your interest. But back to your engine is it a 8 or 10 pin tether?  If it's an eight you will have to ad an extra ground wire from the sensor to the EOB motherboard.  This sensor board failure was common in early 3rdrail engines where the sensor board uses chassis ground on the engine and the ground was somehow lost between sensor and the EOB in the tender.

that is if you decide to not go with an ERR UPGRADE

I would suggest this one if you go with a Cruise Commander. The CC comes with a new R4LC so you only need connectors for the two audio boards. The pins appear to be clearly marked. You may have to buy or fabricate a connector between the Cruise Commander and audio motorboard for the serial data. 

RS4 and RS5 boards are interchangable.

Pete

I have EOB boards if you need a replacement, much less work and cheaper as well than a full $200 upgrade from ERR for cruise and sound.

Very quick response by some helpful folks. 

I'm still evaluating my options on this locomotive.  The speed sensor is burned up and I was told these things are extinct.  This is the only loco on my roster with this system.  Further checkout of the R2LC (08) revealed it is no longer serviceable.  So a EOB motherboard/driver unit?  Receiver for sure?  Speed sensor board, absolutely?   Worth it?  Who knows.

Eight conductor tether with a ground pulled through.  Tender ground, tether, loco frame, solder pad on sensor board all one electrically.  

I'm comfortable with the ERR driver boards.  Serial out to, and used by a railsounds motherboard with my good sound and RS power supply may be the most cost effective route.  

I think I researched all the Lionel motherboards and the  have the 691-MB08-A01 on my short list.  Not to spendy,  even from Lionel, and, I need some other things as well.  Thanks for the confirmation. 

If you're talking the R2LC and the EOB board and sensor, then it starts to make sense to buy the ERR setup.