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Linux-based DIY DCC (ModelRailroad Digital Command Control)
The project has morphed somewhat from its starting point. There's now a LOT of hardware bits, designed in CadSoft Eagle (V7, not the AutoDesk versions) and low-level code for PIC and ARM embedded micros. The Linux kernel driver for the original hardware is still there but increasingly redundant.
easy Linux environment controlling trains in Python
ELECTRIP is an easy-to-use, small program that lets you control your modelrailroad with gamepads. Combined with an SRCP-Server (e.g. srcpd) it provides the functionality you would expect of a commercial digital command station. It can save you a lot of money.