I found the lyric below by googling. We used to sing it as a round at school. We definitely had "san francisco" in the lyric and "Navvy" was substituted with "Feller" Probably 'cos at the time "Navvy" was derogative term used for Irish immigrant workmen and even in those distant un-pc '60s they didn't want to offend. Maybe even railroad feller was the original...

And a hog-eye
Railroad navvy with his hog-eye
Row ashore, and a hog-eye oh
She wants the hog-eye man

Oh go fetch me down my riding cane
For I'm goin' to see my darlin' Jane

Oh the hog-eye men are all the go
When they come down to San Francisco

Now it's, Who's been here since I've been gone
A railroad navvy with his sea-boots on

Oh Sally in the garden picking peas
Her golden hair hanging down to her knees

Oh Sally in the garden shelling peas
With a young hog-eye sittin' on her knees

Oh a hog-eye ship and a hog-eye crew
A hog-eye mate and skipper too

(as sung by Ian Campbell)