Specifications include, but are not limited to: 2.2 Phase 1: Documents Research It is important that there is a thorough understanding of how the railroad preemption is expected to operate. To determine this, it is anticipated the consultant will need, at a minimum, the following documents: • Information on the original design of the preemption system. If this is not available, then it will need to be created by completing WisDOT’s guide for determining time requirements for traffic signal preemption at highway-rail grade crossings. • Railroad circuit drawing (request from appropriate RR). If not available, obtain the timing parameters from the circuit drawing (provided by RR). • Existing traffic signal controller settings so that you can use those to either design or confirm the operation of the system. • Traffic Signal cabinet drawing • Traffic Signal Plan (including sequence of operations) • Traffic Signal Controller program • Time Requirements for traffic signal preemption at highway-rail grade crossings • Timeline of preemption operation • Event log data (when available) from the railroad • US DOT Crossing Inventory Form 2.3 Phase 2: Review event log data from railroad Most bungalows with preemption have an event logger. After requesting and obtaining this documentation from the railroad, these logs will need to be reviewed and analyzed prior to the annual onsite inspection. The event logs should provide information in regard to changes that may need to be implemented at the time of inspection. The data logs should provide information such as APT and total time which must be reviewed relative to the preemption operation at the subject crossing. 2.4 Phase 3: Field Testing The consultant will need to coordinate with the City of Madison and the appropriate railroad to coordinate a time for field testing and be present during all testing. During the field testing, the stakeholders will simulate a train, and document the results. The annual inspection form details the information that is expected to be confirmed in the field during the testing. Multiple test runs may be required for issues that are discovered and addressed in the field. Issues that cannot be addressed must be documented on the form and receive post annual inspection attention.
