In late 2020, it was discovered that there was a misalignment of the wheels and rails in the double-crossovers (also known as “frogs”) due to the wheels being too narrow. As a precaution, speed restrictions were put in place for all trains traveling through the double-crossovers. An independent industry expert was engaged to evaluate the situation and recommend a solution. The recommendation, that was agreed to by HART, DTS and HDOT, included a short-term solution of performing a weld of the double-crossovers to fill the gap caused by the narrow wheels. The longer-term solution is to replace the wheels. The welding work has been completed and approved. The first replacement wheel-sets for the trains will be on-island in the fall of 2022. All trains will eventually be fitted with the new wheels.
It was also discovered that the track gauge in certain areas of the double crossovers was too tight. The tracks have been adjusted and the gauge issue has been resolved. Based on the work that has been performed, tested and approved, the speed restrictions for the trains has been lifted and normal testing operations are underway.