Here's are the active M3s in passenger service on the LIRR, for those wondering. All underlined units were observed from September 2023 up to now : 9789-9790, 9793-9794, 9797-9798, 9803-9804, 9805-9806, 9807-9808, 9809-9810, 9815-9816, 9817-9818, 9823-9824, 9825-9826, 9827-9828, 9829-9830, 9831-9832, 9835-9836, 9837-9838, 9839-9840, 9841-9842, 9849-9850, 9853-9854, 9855-9856, 9857-9858, 9865-9866, 9873-9874, 9875-9876, 9879-9880, 9883-9884, 9885-9886, 9889-9890, 9895-9896, 9897-9898, 9903-9904, 9907-9908, 9909-9910, 9911-9912, 9913-9914, 9915-9916, 9919-9920, 9921-9922, 9923-9924, 9925-9926, 9927-9928, 9933-9934, 9935-9936, 9937-9938, 9939-9940, 9941-9942, 9943-9944, 9945-9946
* Work service units: 9775, 9901-9902, 9932
Preserved: 9801-9802