Carriages were initially decorated with crests bearing Paris' motto fluctuat nec mergitur (tossed by waves, yet does not sink) in embossed brass. The coat of arms is a reminder that the City of Paris originally owned the infrastructure operated by the CMP.
One of the challenges involved in refurbishing the train was reproducing the emblem, as only one out of the ten coats of arms that adorned a train was preserved over time. As the original manufacturer no longer existed, another solution had to be found.
By combining RATP Group’s skills and modern technologies with traditional expertise, the emblem was brought back to life using Autodesk, based on a 3D scan carried out at RATP.
Since then, additive manufacturing technology was identified as the most effective method of testing new processes. During an initial trial with 3D Métal Industrie, a sand mould was successfully printed, relying on a technique dating back to antiquity. The crest was cast in the mould created by the new technology, and then polished to restore its original shine.