Lionel Coal Tipple...arcing as cars enter and exit.

I added a video

Is the neutral (U) of the track transformer tied to the neutral of the accessory transformer?  If not, then that is your problem.  Tying the neutrals together will put the transformers “in-phase” with one another and prevent arcing when cars cross from one transformer powered track to another.

Thank you for the reply...as I stated... the same power supply is providing power to both the coal tipple and track...so are not the neutrals tied together? The tipple for all intense purpose is power by track power....one supply powers both.

Sorry about that, I must not have read your description closely enough. 

From the Lionel manual the transformer A (track center rail) must go to Tipple Accessory inner terminal (see diagram).  That would be the red terminal on your RealTrax lockon. 

The transformer U (outer rail) must go the Tipple outer terminal.  Black if you are powering with RealTrax lockon.  Please make sure wires aren't turned around. 

I thought before I installed the tipple I had the right wiring configuration....I purposely used a color coded wiring scheme...yellow power.... white (U) return. I would have sworn I saw that diagram and made the right connections. After removing an access door, I saw that the U terminal was incorrect...I switched the power leads to match the diagram ....and behold the issues has gone away.

Magic.....

Time to download the manual🤣...and double check my work.

Thanks for the help.