Noah Hodgkiss, 56, did not notice the train thundering towards him because he has cataracts and hearing problems.
To make matters worse, the batteries on his hearing aid were flat and he had no idea the train was there until he glanced over his shoulder at the last second.
“I was right in the middle of the two tracks when it happened. Before I knew what was going on it was on me.
“I tried to leap out of the way but it was too late and it hit me from behind. I can’t describe how it felt, I was just thinking what was going to happen to me.”
Mr Hodgkiss flew several metres down the track but remained conscious.
A dog walker heard his cries for help and dialled 999.
Mr Hodgkiss’s ordeal happened as he walked in Tibberton, Worcestershire, on Saturday.
He dropped his mobile from the railway bridge but, as he was looking for it, the train slammed into him.
He was airlifted to hospital and treated for arm injuries, a broken pelvis and ribs but discharged himself on Monday.
“I don’t even have the phone – it’s in A&E somewhere smashed into a million pieces,” he added.
“I have been unbelievably lucky and I will never go near the railway lines again. I’m not a hero, I’m an idiot.”