Roger, do you mean a crew change point? The term division point can be ambiguous but generally means a terminal at the boundary of a division or within a division where crews change (although not all of them necessarily will). Farnham was actually the division headquarters until transferred to Sherbrooke in the 1960s. A division point exists even if some trains do not change crews there.
I'm not certain of which crews on through trains worked through Farnham and which changed there. Trains on the branches north and south, and locals on the main lines terminated there. Cars on these local were switched at Farnham. Some other traffic was also switched at Farnham but I'm not familiar with the details or the reason why it couldn't be switched at Montreal.