NHDOT Commuter Rail

 (reporting mark NDOT) is a commuter rail service operated by the running between  and the. The service uses the existing trackage of and the. Service began on May 5, 1997.

Locomotives
The service began with six SD35PH engines rebuilt from former /  engines.

In 2008, NHDOT took delivery of nine locomotives. In 2010, eighteen compressed natural gas-powered NHDOT CNGMU I trainsets built by were delivered. In 2015, fourteen locomotives were delivered, allowing the aging SD35PH's and F40PH's to be retired. Three out of the four F40PH's were sold to RPS Rail of El Kadsre who sent them to for rebuilding into MP32PH-Q2 locomotives, while the remaining one was sold to the  for use on the  service.

On May 15, 2018, an out-of-service NHDOT CNGMU I exploded outside Manchester when it crashed into a clearance barrier and ruptured the roof-mounted CNG tanks. The driver survived with third degree burns and was airlifted to 's Sumner Redstone Burn Center in, other crew members had jumped clear seconds prior to the explosion.