bees in railway sleeper?

I very much doubt that they would be bees, more likely to be wasps.

do they look like this


or this

I doubt they are honey bees. But if they are are you move the sleeper then I would put your  running shoes on.  If they are not a problem leave them there.  Bees will not sting you unless you are a threat to them. For example if you stand there and throw your arms about then you are going to get stung.  I spent most of yesterday sat 1 foot away with no vial on watching my bees coming and going. I had two bees land on me in four hours (I know sad 4 hours watching bees) and they did not sting me just flew off again.

never seen a live one thank heavens.