To wander in search of work. Hence tramping, on tramp
"Tramping" was well established and regulated among artisans of all sorts including stonemasons, carpenters and bricklayers who made up substantial sections of the workforce constructing railways [i]. The navvies who moved the rocks and soil were called Excavators. They seem to have developed an informal practice of funding one of their number (giving him a "tramping bob") to go in search of work when a job was coming to an end or if they were unhappy with their current employer. [ii].

References:

[i] Hobsbawn, Eric. Labouring Men: Studies in the history of labour (Wiedenfeld & Nicholson, London, 1964) pp 34-63
[ii] Brook, David. The Railway Navvy 'That Despicable Race of Men' (David & Charles, Newton Abbot, 1963) p

A trapper was a child employed to open and close doors in roadways along which the coal tubs were transported. The practice of employing boys to do this work continued after the 1842 Act Mines and Collieries Act prohibited all girls and boys under ten years old from working underground in coal mines.

Reference:
Mining Occupations, Durham Mining Museum website http://www.dmm.org.uk/educate/mineocc.htm

Trap: A small carriage on springs; usually, a two-wheeled spring carriage, a gig, a spring-cart [OED]

A bag for holding provisions, clothing, books, etc [OED]

Treadmill: A horizontal cylinder made to revolve by the weight of persons treading on boards arranged as equidistant steps around its periphery. Use as an instrument of prison discipline. 

Of places or things: neat, tidy, well-kept. [Dict. Scots. Lang]

The first or second stomach of a ruminant, esp. of the ox, prepared as food; formerly including also the entrails of swine and fish.
plain tripe is the first stomach, paunch, or rumen, honeycomb tripe the second, or reticulum. [OED]

The feet of a quadruped, especially those of sheep and pigs as used for food.

Seemingly trousers of some sort.

To believe, give credence to, trust, have confidence in [Dictionary of the Scots Language]
In the context of bar708~Rothsay Castle Steam Boat it seems to be an assertion of veracity [CPB]

trunk_lines¹ A main railway line. (OED). The OED dates the first usage of “trunk line” to 1842

To do something in order to see what will come of it, or whether it produces the expected result. [OED]

A small truck into which the cut coal is filled. It was also used as a verb meaning to transport in tubs.

tub(1) A small truck into which the cut coal is filled. It was also used as a verb meaning to transport in tubs.

Strike [CPB]

A driving equipage; a carriage with its horse or horses, and other adjuncts [OED]

On strike. turnout; a strike

Meaning uncertain

Toll road established by act of parliament and maintained by bodies known as Turnpike Trusts. By extension, any main road.