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21st Century Locomotive Technology: Technical Status Report 30 DOE/AL68284-TSR30 In all cases, the Hybrid Trip Optimizer was engaged to develop an optimal driving plan for the train. The resulting fuel savings were compared to a baseline of zero hybrid locomotives with Trip Optimizer engaged.. Thus the figure shows the extra fuel savings benefit of hybridization over and above the benefits of Trip Optimizer alone. The first important result is that the benefits of hybrid locomotives are not negated by the use of Trip Optimizer. Secondly, there is a wide variation from mission to mission in the benefits enabled by hybrid locomotives operating under Hybrid Trip Optimizer control. This is expected and conforms to analysis of hybrid locomotive performance with no Trip Optimizer: missions over flat topography with little braking or speed changes yield relatively little fuel savings. Restated, some missions are much better suited for hybrid locomotives than others. Further analysis will be carried out to elaborate on this point. Validation of optimized battery thermal control A full-scale locomotive sodium battery module with internal forced-air cooling, manufactured by GE Energy Storage Technologies (Figure 2) was made available to the project as in-kind cost share. Work was initiated to fixture this battery in readiness to validate the operation of the optimized thermal controls developed under this project. Fs b Figure 2: full-scale locomotive sodium battery module.