. Thus, will be used exclusively by trips transferring from line 
to other lines. Since there are no auxiliary modes connected to , no access and egress movements are possible.
is the access node. All outgoing line segments are connected to this node, as well as are all incoming and outgoing auxiliary mode links. All lines allow only boarding, but no alighting at this node. Thus, will be used by all trips accessing the transit system at node T, as well as by all trips passing T on auxiliary mode links.
Figure 2 below illustrates the transformation of the transfer node T.
Figure 2: Extended transfer node structure
Note that the ``blown up'' transfer node allows for exactly the same set of route choice strategies, with exactly the same costs associated to each. But depending on the behavior of a strategy at the transfer node (egress, transfer from line
