In the mid 1960s, the ACR needed a little more motive power, but couldn’t afford anything new. What they could afford was a used unit, in the form of recently-retired Boston & Maine F2 #4255, which arrived in 1967, only to almost immediately have a headon collision with a runaway flatcar loaded with pulpwood, which mangled the nose of the unit and forced repairs before it was usable.
After some metalwork in the ACR’s shops, it emerged as ACR class G2A with a GP-style low nose, in which form it operated for the next 45 years (becoming the last operational unit on the railroad after deferred maintenance and declining traffic put all of the ACR’s other diesels out of service.)
It survived into D&H ownership in 2013, and still operates today as part of the Parsons Vale’s museum fleet.