Please reread the novel. They did not know it wasn’t working. The conductor told Ms. Taggart, “I don’t think the signal’s going to change. I think it’s busted.” Taggart’s instructions were intended to TEST the HYPOTHESIS that the signal was broken. That’s why she said, “Proceed with caution to the next signal. IF it’s in order, proceed to the main track.”
But it’s impossible for Rand’s depiction to be accurate. She said, “Proceed with caution to the next signal. IF it’s in order, proceed to the main track.” This returns us to my original point that there is no next signal. Folllow closely now. One signal directed the train onto the siding. There may or may not have been earlier signals indicating caution, but they don’t matter. The train entered the siding and stopped for a signal. If you’re wondering how a siding is laid out, I’ll tell you: the stop signal is at the end of the siding, before the switch. It may be preceded by signals indicating caution, but they also don’t matter. If they proceed past the stop signal, they ARE entering the main track, because the next signal is on the main track.
You’re dragging this out painfully. Admit your ignorance of the subject, whether or not you admit Rand’s, and end this painful charade. I can’t bear to see you beating yourself silly in this way.
Also note, while you’re rereading your novel, that Rand keeps referring to a “red light,” and inserts dialogue like, “red means danger, lady.” This tells us that the signal in question used lights rather than, e.g., semaphores. But when you read the Wikipedia article on North American railroad signals, you (hopefully) noticed something: unlike traffic lights, railroad signals are much more complicated, involving multiple lights that may be on, of or blinking. Specifically, signal #290, “stop and then proceed,” is made of multiple lights, as is signal #291, “stop.” Neither can reasonably be described as a “red light,” nor would railroaders do so.
Which leaves exactly two options. Either Rand was visualizing a automobile traffic signal, and thus made the “red light” blooper, or else she really was describing a signal with only one red bulb. There is such a thing: namely, a two-aspect or three-aspect signal. Either has a single red light (though a two-aspect signal might have only a yellow and green light). If Rand wasn’t simply mistaken, and was intentionally referring to a two- or three-aspect signal, then that destroys your theory about rule #290: neither signal can give the indication “stop, then proceed.” That disposes of most of your post, where you persist in your mistaken clinging to rule 290. There is no way that can be the signal referred to by Rand.
–Len.