Thank you, Baker!
Trump re-tweeted The_Trump_Train with just a single link to an image on 11/28 in 2018.
Haven't checked POTUS' tweets tonight yet, but I suspect Q's screencap is older and that account of The_Trump_train has been suspended for a while already.
Image hash (1875d90a0bb…) also appeared on 8chan previously (e.g. in bread #7894).