This is a pre-market engagement exercise for the procurement of wagon modules for long switches. Network Rail has a requirement for interchangeable Wagon Modules for the transport of switches. This procurement will include the design and build of interchangeable modules for the existing 4x WASCOSA FEA-W Wagons to carry switches (from 25m to 75 metres (‘G’ to ‘J’ size)). FEA-W Wagons are container flat wagons that carry a variety of infrastructure materials using interchangeable modules and have been manufactured by WASCOSA. The base wagons themselves will not be modified. The interchangeable modules are used for different purposes for carrying like – track panels and sleepers; carrying switches; and for carrying rail.