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明确了信号显示制度的概念及分类，速度等级及信号显示的速度意义，提出铁路提速将引起信号显示制度向速差式发展，以及机车信号向主体化发展的必然。
The concept and classification of signal display system, the speed grade and the speed significance of signal display are clarified. It is proposed that speeding up of railway will cause the signal display system to develop toward speed difference and the locomotive signal to the subjectivity.