The firm is strengthening its capabilities to win more work in the growing transportation sector.

McAllister will take the construction lead role for the rail business working closely with Nigel Cole.

He joins Mace from Kier where he was rail chief, having previously worked for Birse Rail and Alfred McAlpine.

Although during the past 12 years he focused on delivering multi-discipline rail infrastructure projects, his knowledge is founded in heavy civil engineering, including roads and airport schemes.

He has worked on projects such as the King’s Cross Station Roof Redevelopment, Crossrail Advanced Works, West Coast Mainline Upgrade Projects and the recent redevelopment of Epsom Station.

Butterworth (above) previously worked for WSP as a director of infrastructure and before that McNicholas, NG Bailey and Carillion.

He played a pivotal role in the growth of WSP’s rail business including high profile projects such as Crossrail Bond Street Station, West Coast Main Line Electrification and Thameslink’s London Bridge Station.

Jason Millett, Mace chief operating officer for Major Programmes and Infrastructure, said: “We are delighted to welcome Jason and Adam to Mace’s infrastructure team.

By adding their wealth of sector knowledge to our team we will be able to support more clients in delivering their strategic plans and projects.”