17 depot tracks are used for passenger. 19 exist.
During peak periods the 17 depot tracks are never empty for very long especially nif equipment is being manipulated as a result of earlier delays of service distrustions. If Midtown trains from Dover and Great Notch get thrown into the mix it can get pretty messy very quickly.
The yard has room for about 5 extra trainsets during mid day layovers but only two spots capable of handling anything bigger than 6 cars. This is why the Port Jervis 7-cars sets run all day with middle trips. Hoboken Yardmasters have gotten creative and stored big trains on main tracks as a last resort when yard space runs tight.