Glowing UFO traveling over Huntington, New York

On April 17, 2019, a witness saw UFO traveling east on the Long Island railroad, in Huntington, New York. What is it?

Eyewitness statement:

Traveling east on the huntington line of the long island railroad, i have seen this object many, many times. after noticing it yet again i decided to take a video and some pictures so i could determine what it is. i used my iphone 7plus to take the video and the pictures. as soon as i took the video, the object accelerated north east and vanished. as i have stated, i have seen this object many times and would like some clarity, if any, that's available. i would also like to know if anyone else has seen this object. the video was taken as the train was traveling east inbetween the towns of westbury and hicksville. i'm getting a little worried and paranoid now that i have seen it more than a handfull of times. please feel free to contact me if there's an explination. the photos are screenshots from the video.

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Source, 19th April 2019