Ansaldo N4519107601 N4518107601 MicroLok II Module Track Card

Ansaldo MicroLok II Module Track Card, bearing part numbers N4519107601 and N4518107601, is a two-board module designed for use in MicroLok II interlocking systems to connect a central CPU PCB with track-circuit hardware. The N4519107601 PCB is a MicroTrax‑coded track circuit board, specified for 40 Hz cab-signal‑compatible applications within the MicroLok II family (with related variants for 100 Hz, 50 Hz, and 60 Hz cab signaling). The accompanying N4518107601 PCB provides the OS Track Circuit functionality within the same module, integrating essential track-circuit interfaces in a single card for deployment in legacy signaling installations. These PCBs are intended to plug into a MicroLok II cardfile, a Eurocard‑based enclosure that houses standard plug‑in PCBs, with each slot accessed via a 96‑pin lower connector for inter‑board communication. In operation, MicroLok II track cards serve as the interface between the CPU logic and coded or OS track circuits, supporting train detection and interlocking in general non‑cab and cab‑signal environments. This module form factor is commonly used in analog-era signaling projects as a spare or replacement part within existing MicroLok II architectures, facilitating maintenance and potential retrofits while preserving established cab signaling configurations.