'"Not to worry," she said. "All you have to do is walk straight at the barrier between platforms nine and ten. Don't stop and don't be scared you'll crash into it, that's very important. Best to do it at a bit of a run if you're nervous. Go on, go now before Ron."
"Er-Okay," said Harry.
He pushed his trolley around and stared at the barrier. It looked very solid.'
HARRY POTTER AND THE SORCEROR'S STONE pg. 93