END OF AN ERA. The old alliance of 1800 HP. ALCo. power hauling Materfer (Argentinean)-built coaches held an almost half-century long monopoly of commuter haulage on the General San Martín RR.'s local line from Retiro to Pilar, but all dynasties invariably have to come to an end. So it happened in April 21, when the complete replacement of locomotives and cars was consumated with the retirement of former equipment being superseded by brand new Chinese-built rolling stock. The then everyday scene of an ALCo. RSD16 pulling red-blue-yellow coaches will, sadly, no longer be repeated.