Need help with brand new TMCC Tank Train

Just throwing out some ideas chipset:

Are you addressing the engine you want to run? I.E press ENG 31 or 32 or whatever?

When you address it, it doesn't come up on the remote?

Did you follow the locomotive owners manual regarding operation as a lashup? There may be some confusion here, When Lionel locos are "lashed up" they each get their own ID, they also get programmed to respond together as a a single "lashup" ID#.

The single ID# allows them to run together and respond accordingly.

IE lights changing direction between units when the locos, front coupler being the front coupler of the lead unit, rear coupler being either front or rear, on the rear unit depending on which way it is facing.

Using the lashup ID makes them respond as a pair, or you can select their individual features via their individual ID for situations when you want to drop one loco, running one independently. 

The " forward" orientation of the rear unit usually has to be selected.

They have to be programmed in "TMCC mode" they will not respond in "Legacy mode"

It shouldn't be removing locos. removing a loco requires selection and deletion.

Put both locomotives on the track, power up the base, power up the remote, power up the track, do both locomotives sit still?  Now press the ENG button on the Cab-2 then press 31 then then the horn button, what happens?  now press the ENG button then type 32 and again push the horn button, what happens?

I have 6 engines programmed into my CAB-2. Pressing the ENG button on the CAB-2l allows me to choose between 2 locomotives since I only run 2 at a time. If I replace an engine I have to manually enter the engine ID#. After that, simply pressing the ENG button will bring up that locomotive ID#.

 Thanks guys, seems I was trying to cycle thru the engine numbers i entered by pressing the ENG key repeatedly unil I saw the number I wanted.

My apologies, i was using it wrong.

I will run upstairs and do like you all said, i.e. actually enter the number, I bet it works!

Pushing ENG button cycles between the last two locomotives you addressed, a new/ different loco will have to be addressed with the keypad. Then the ENG button will cycle between that loco and the one before.

The ENG button only is basically a shortcut to reduce the need to type in the ID# every time.

Typically, addressing a loco involves ENG and then the ID# 

Thanks Rick, all is well now, except looks like a messy overlube from the factory or store.

I am cleaning a oil/grease mix off the gears as the lead loco is having issues, i.e. slow gear movement despite high throttle etc, and a short movement followed by slow or no gear movement and zero loco movement.