Jacobs and Atkins have both secured contracts with Network Rail for the design of works in west London as part of the £15.9 billion Crossrail project.
Jacobs will design the Stockley Flyover scheme, which will improve the capacity of the lines in the Heathrow Airport Junction area in west London.
Meanwhile Atkins will design a scheme that will see a dive-under constructed at the west end of the Acton freight yard as well as other modifications to the yard. The scheme will enable westbound freight trains to leave the yard without affecting passenger trains.
Network Rail is responsible for the design, development and delivery of the parts of Crossrail that are on the existing network, covering 70km of track and 28 stations from Maidenhead in the west to Abbey Wood and Shenfield in the east.