TAS EOB/TMCC issue FIXED- THANX!!!

I think you'll have to open it up.  The symptoms indicate a problem with the flywheel encoder, could be as simple as a loose plug or maybe the tape on the flywheel has gotten dry and the encoder strip has slipped.  Could be a broken wire to the encoder as well.

Another possibility is the fact that it takes off may indicate it's in conventional mode, which would indicate it's not seeing the TMCC signal.  This could be an antenna connection issue or loose boards.

First step would be to check all the board and connector seating internally.

Pete, I just went through this on 3rd Rail engine. Constant whistle blowing indicates a problem with the speed sensor not reading properly. In my case the sensor had shifted about 1/8" from center of the timing wheel. It doesn't take much to produce the error.

Pete

Had the same issues with a KLine GG1.  Shipped to Brasseur.  Took them weeks to get it working. I believe they removed EOB and put in complete new driver board.  Never worked reliably after I got it back. They kept giving me different start up proceedures which would sometimes work, sometimes not.  Finally found a tech in PA. who tested the engine, replaced the receiver board, and the engine has worked reliably ever since.

I would agree with both responses. Check flywheel tape and tape reader.

That was it!! Thanks everyone for the fast, correct answers!!!

Sensor slipped?

When I opened the loco, the sensor was completely loose. Super glue failure or it was glued to an unclean surface... my bad..........

Pete,

Glad to see that the Big Boy is back on its feet! Thanks for posting the solution.

Chris

LVHR