04年写的铁路信号系统中的铁路战场图绘制部分的源程序，接触网运营检修系统演示版的源代码，程序源代码可在VC++6.0下顺利编译。-Written in 2004, railway signaling systems in the railway battlefield mapping part of the source code, catenary operation maintenance system demo version of the source code, source code