Exactly 52 miles.
This is the route:
4 miles
The distance between the Canadian border and Plattsburgh, NY is approximately 16 miles.
294 miles
161 miles
It is 663.01 miles according to MapQuest.
About 625 miles (10½ hours by car)
Trenton is 366 miles from Plattsburgh.
13 miles.
They are 161 miles away. The estimated time of travel is 3 hours.
The present Cascade Tunnel is 7.79 miles long. The original Cascade Tunnel was 2.63 miles long.
The shortest driving distance is 62 miles. (100km)
It is 163 miles according to Google Maps.