I'm trying to finish the game without glitches but I can't get past the first barrier on the rails to get to the roof of the house in Act 3. Can someone explain the technique I need to use, please

You can watch the Glitchless wr by glitchyboi to see how he does it, ill leave it here:

Thanks, but I already did that, I don't understand. He runs and crouches, right?

I think i he crouches and goes around the rail so he doesnt fall, but thats my guess

I think so too, thanks a lot for your answer.