To implement the equilibrium transit assignment discussed in the previous section, the following basic EMME/2 tools are used:
- Fixed cost transit assignment (Modules 5.11/5.31): This is the standard EMME/2 transit assignment model. It implements the optimal strategy assignment described earlier. Of course, in EMME/2 the transit network is expressed by explicit transit line itineraries, so that the user need not be concerned with the ``exploded'' network representation used here for the mathematical formulation of the model. The travel cost on each transit line segment is given by applying the corresponding user definable travel time function. The assignment can be finetuned by various parameters and weights, which are not discussed here.
- Network Calculator (Module 2.41): This is a very general tool to evaluate algebraic expressions combining any kind of network information. Automatic conversion between the different element levels (node, link, transit line, transit segment) is provided.
- Matrix Calculator (Module 3.21): Similar to the Network Calculator, this tool allows the evaluation of expressions containing any kind of matrix information. Automatic conversion between the different matrix formats (full matrix, origin vector, destination vector, scalar value) is provided.
The travel cost function 
