Hi all. I'm learning this song, Night Freight, by Don Bilston

I wonder if anyone could a) see if they seem right , and b) enlighten us to some of the slang or idiomatic parts?


NIGHT FREIGHT
(Don Bilston)

When people lie asleep in bed
It’s then I book on at the shed
Prepare me engine take on coal
To journey on the iron road

It’s off the shed to shunting yard
Exchange a few words with the guard
Forty wagons make the train
The green light glows we’re right away

The signal gleaming through the dark
The steam gauge needle’s on the mark
The tea-can warms upon the hob
And the engine’s gaffer of the job

The fireman in the firebox glows
Swings the shovel to and fro
Checks injector crack of coal
I’ll give her more steam lad watch her roll

We hop the twig through town and shire
The chimney belching smoke and fire
Our destination comes in view
And the night is almost half-way through

Now relieved by another crew
It’s in to the cabin and make a brew
A yarn and a smoke and you bet your snap
That leaves half hour for to take a little nap

The train we work backs at the peg
It’s time to wake and show a leg
Come stir yourself mate rise and shine
Or I’ll get papers for losing time

We get back home and it’s off to bed
Farewell a while you loco shed
When the daylight’s gone and the night has come
I'll be back again for another night's run.

https://www.youtube.com/watch?v=AGNn_3rFsOA