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When it comes to my railfan knowledge, signaling and train dispatiching is my "Achilles heel." As such, I have several rather basic questions: 1.) What are ABS, CTC, and DTC, how do they differ from standard signal blocks, and how do they work? 2.) Why do railroads use Track Warrants, instead of just standard timetables and train orders like they used to, telling trains where to go and when? 3.) Why did railroads switch in the first place? 4.) How do railroads keep track of their massive fleets of cars and locomotives? These may seem like very basic questions, but I am truly in the dark in this area of railroading. Any help you could give me would be most appreciated. Thank you, Daniel
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