K-Line F3 will not run in command mode

Sound like a cruise board without the Serial data coming in.  But it goes as soon as power applied?  Can it be placed in neutral?  G

Not much to add except when changing from conventional to command do you power down the layout and start over. The engine is missing the TMCC signal for whatever reason. (Antenna problem??)

Yes, in conventional mode you can go from forward to neutral to reverse, etc. Does that mean that possibly the R2LC board is bad.

I don't recall that any K-Line F-3s were equipped with cruise. Anything they made would have had the K-Line cruise, which is different from the Lionel versions, but I don't think they ever put them in any F units.

Yes, K Line did have cruise in F3s.  I have a set of NYC ABA.

There are cruise switches in both my A units.

What if you were to check for these and if you have them.....switch the cruise off and try again?

Dave

Ditto, I upgraded one.  They actually Slaved a pair of Cruise motor drivers.  G

Check the wire from the command base to the track. I had a Lionel camelback do the same thing. The wire connected to the command base was a little loose and when I tightened it, it works perfect now. My other TMCC engines worked fine so the reciever in the Camelback must not recieve the signal as good at the others.

My RDG F3 (AA) came with cruise; however, the tailing unit failed and it was at Kline when they went under.  I got the engines back a year later and I found them when I was dismantling the layout. While it was not the cheapest solution ($500+), I had them converted to Proto2 with a slave unit in the trailing B. Nice puller with the 4 motors and will share duties with the T1 on the rebuilt layout pulling 8 Kline Rdg Streamliner cars.