Lionel SD70ACe consisting

It's been a couple of weeks since I fooled with consisting. 

As I recall...(programming on main)

For running "Elephant Style"

Select 1st locomotive address

Select CV19

Choose a consist address of 1 -127

(Optional)

Select CV50

Set CV50 to 1 (this sets up lights for the lead locomotive)

Exit programming mode

The horn should sound indicating the locomotive is programmed.

Select 2nd locomotive address

Select CV19

Set to the same consist address as the first locomotive

(Optional)

Select CV50

Set CV50 to 3 (this sets up the lights as the trailing locomotive and also shuts down the horn and bell)

Exit programming mode

The horn should sound indicating the locomotive is programmed.

Both locomotives (facing the same direction) should now operate under the chosen consist address. 

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For back-to-back operation, set CV19 to 128 + chosen consist address on the second locomotive.  The second locomotive will operate in reverse of the first locomotive.

Hope this helps.

Rusty

You don't need the "Program Switch" for DCC, that's for Legacy/TMCC programming only.  Leave them set to "run."

Rusty