Finance director David Callé takes over as chief executive. Previous owner John Murphy has retained a stake in the business and has become executive chairman.
Quattro Group was founded by Mr Murphy in 1989 and has grown into a £40m business.
Since its acquisition of BCL Rail Plant in 2008, it has been a leading supplier of operated road-rail plant. With more than 265 road-rail vehicles (RRV), Quattro Rail reckons to have a 30% share of the operated RRV market in the UK.
Mr Murphy said: “Having built the business over the past 24 years, the time is right to further its development by passing control to the management team. Over the past five years, this team have helped develop the business into the leading RRV provider in the country and they are perfectly placed to continue driving it forward.
“The buyout is all about maintaining the momentum of the organisation, and my new role as executive chairman means I will remain involved as the management team take Quattro Group on to the next phase of its development.”
New chief executive David Callé joined Quattro Group with the acquisition of BCL Rail Plant, a deal that doubled the then size of the organisation.