The NSEL Testing Floor encompasses a 15 x 40 m (49.2 x 131.2 ft) area. The infrastructure of the floor is a 5 m (16.4 ft) deep concrete box girder design. The girder mass is approximately 2.72 x 10^6 kg   (3 x10^3 tons) and has been implemented for use on tests of full-scale bridge girders. The floor also acts as an effective reaction structure for dynamic experiments and it is now being used to support the new 6.80 x 10^5 kg cranes with capacities of 1.81 x 10^4 kg (20 tons) and 3.62 x 10^4 kg (40 tons) with a clear height of 9 m (29.5 ft).