I think the best cry on cue actress is Missy Peregrym on the current FBI. Many scenes don’t cut away as she starts bawling.
https://tenor.com/view/fbi-missy-peregrym-sad-cry-gif-16496300
I haven't watched any show on network T.V. in almost 30 years and don't watch ANYTHING at all except Brit series on PBS.
But I do know about actresses in the movies, almost from the start of movies through the late 1900s. :-)