R/F Choke Installation In Legacy Sd70ace

There may be more than one, probably one from each pickup location.

I found the wire and installed the choke but the problem still exists. Is there any other solution to fix the problem other than a r/f choke?

No, but there may be other causes. Some atlas lighted cars cause the same problem

Lets go back to 2002 or 2003 when dcs. first came out, I had a Lionel 2-8-0 UP (without cruise) that destroyed the dcs signal..... You could put a proto-2 engine in test mode with a perfect signal and bring theTMCC engine into the block and watch the dcs signal drop off as the engine got close to the proto-2.

The fix...  I had read that Atlas"O" locomatic command system required a choke in all the lighted pass cars,so...  I contacted Atlas and Jim Weaver sent me 4 of their chokes(free) and I installed one in the engine (board in engine with r2lc) in series between the rollers and circuit board. Guess what.. it didn't work.. However it did work on the ground side. Finding all the commons was a little difficult  but worth the effort.

I could park the TMCC engine next to the proto-2 with no dcs signal loss. The tender didn't require any modification.

Try it on the common side rather than the hot. The TMCC signal is on the outside rail maybe that's the difference.

The wire?  Are you sure you got all the connections from the pickups?