"Rain, Steam and Speed" by The Men They Couldn't Hang may be borderline as they're folk-rock anyway, but it is about building Brunel's stuff so fits in with the OP's interest in working songs. And it looks forward at the end to the channel tunnel.

But also a few less immediately obvious types --

Wishbone Ash, "Leaf and Stream", unusually acoustic for them:

"Alone I've walked this path for many years,
Listened to the wind that calls my name.
The weeping trees of yesterday look so sad,
Await your breath of spring again."

Crowded House, "Four Seasons in One Day":

"It doesn't pay to make predictions
Sleeping on an unmade bed
Finding out wherever there is comfort
There is pain only one step away
Like four seasons in one day"

Procol Harum's "A Salty Dog":

"Upon the seventh seasick day we made our port of call
A sand so white, and sea so blue, no mortal place at all"

Crash Test Dummies and "God Shuffled His Feet":

"And what with God there, they asked him questions
Like: do you have to eat, or get your hair cut in heaven?
And if your eye got poked out in this life
Would it be waiting up in heaven with your wife?
God shuffled his feet, and glanced around at them
The people cleared their throats, and stared right back at Him."

I've always had a soft spot for Pink Floyd's (Syd Barrett's) whimsical "Bike":

"I've got a bike.
You can ride it if you like.
It's got a basket, a bell that rings
And things to make it look good.
I'd give it to you if I could
But I borrowed it."

And back to whaling, Mountain's "Nantucket Sleighride":

"Starbuck's sharpening his harpoon
The black man's playing his tune
An old salt's sleeping his watch away
He'll be drunk again before noon"