Sentence:  What struck me with most astonishment, however, was the liberal manner of our fair driver, who made no scruple of taking a leap, with the reins in her hand, and seating herself dexterously upon the shafts (or, in Westmoreland phrase, the <WSD>"trams</WSD>") of the cart. 
Meaning of the word marked with <WSD> tags:  The shaft of a cart.