Gulliver, some friends of mine thought that, in 'The Grey Funnel Line,' it was strange that Cyril referred to the Geordie coalmine Walker Shore, but recorded that in the interests of probity.

You really have to research some of his songs. He used naval parlance so extensively.
I asked him. It is walk-ashore, the gang-plank.

There was even an assertion that the pit was walk-ashore on an earlier thread, for the same reason, as it was a drift-mine.