This information is taken from "The American Shortline Railway Guide" by Edwin Lewis (5th edition, published 1996)
The New Hampshire and Vermont operates freight service from a connection with the St. Lawrence and Atlantic Railroad at Groveton NH, to Waumbeck Junction and Woodsville, 60.3 miles. The railroad has trackage rights over ST Rail System from Woodsville to White River Jct. VT, 40.5 miles, where interchange is made with the ST (B&M). A branch line runs from Waumbeck Jct. to Berlin, 19.7 miles. Additional connections were made with the Twin State Railroad at Whitefield and the Berlin Mills Railway at Berlin. By 1995, Most of the line between Berlin and WRJ was out of service. The NHVT was owned by CSF Acquisitions and is affiliated with the Lamoile Valley and Twin State railroads. The NHVT had three locomotives, an Alco RS-11 #405, GP9 #669 and a GP38 #3800.
This information is taken from "The Rail Lines of Northern New England" by Robert M Lindsell published in 2000.
The NHVT discontinued operations west of Littleton in 1995 and received permission to abandon the Woodsville-Littleton and Waumbek Jct-Berlin segments in 1996. The NHVT discontinued operations between Whitefield and Littleton around 1997. The sections between Coos Jct. and Groveton and from Whitefield to Waumbek Jct. were operated by the NHVT to service a (paper) mill in Gilman VT until the fall of 1999, when the mill closed.