Amy Schumer is on the fastest of fast tracks. The successful stand-up comedienne made the transition from the stage of comedy clubs to her own Comedy Central show (Inside Amy Schumer) look like a stroll across a barely traveled two-lane road. But I feared the “Amy Schumer” bubble might have been on the verge of bursting with the imminent arrival of her new film Trainwreck, directed by comedy guru Judd Apatow (The 40-Year Old Virgin and Knocked Up, among a host of other movies that he has produced, written and/or directed).

Apatow is a comedy Midas, so much so that it seems like he doesn’t even have to lay his hands directly on a project for it to take on a golden glimmer, but how long can his run last? All of these concerns barely register as speed bumps on Schumer’s path. Her character, named Amy, is likely a more polished and professional version of the “Amy Schumer” character from her stand-up or some of her Inside Amy Schumer bits, meaning Amy stands before us with backstory to flesh out her comic imperfections. Trainwreck is a flat-out riot, in terms of the romantic comedy elements. The whole cast sells the human relatability of the gags — especially the non-comic players like LeBron James and wrestler John Cena (who is hilarious in his early extended cameo as one of Amy’s lovers who hangs around longer than usual) — but Schumer shows a willingness to fearlessly venture beyond the comfort of easy laughs into real emotional territory. (R) Grade: A