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ergobob (611 posts)
Sep-22-01, 09:10 AM (EDT) "Operational speed question?" Hi Folks,I was wondering if you should slow down to 15 - 20 mph when a track narrows from two lines to one?In other words, there is a switch and the train moves to a single line. Some activities seem to expect you to maintain the line speed like 40 or 50 mph and I do notice that the train does not derail.bob Alert Edit | Reply | Reply With Quote | Top
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Subject Author Message Date ID RE: Operational speed question? rgarber Sep-22-01 1 RE: Operational speed question? s019033 Sep-22-01 2 RE: Operational speed question? ergobob Sep-22-01 3

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rgarber (1624 posts)
Sep-22-01, 09:39 AM (EDT) 1. "RE: Operational speed question?" I'm under the impression if you go 40 through one of those switch extension curves (not the 45 degree ones, the 22 degree ones), you will derail just 1 mph higher. Remove | Alert Edit | Reply | Reply With Quote | Top
s019033 (2 posts)
Sep-22-01, 09:47 AM (EDT) 2. "RE: Operational speed question?" Bob ,Some switches are made for high-speed crossings. Others don't.
If you have to cross a low-speed switch ; you will always be informed with a speed-limit.E.g. : your speed-reference of a track is 100 mph (160 km/h). On this track you have 2 switches : the first of 100 mph (160 km/h) , the second of 30 mph (50 km/h). The first have no speed-limit , the second have a speed-limit which will be informed with a signal to give you the opportunity to brake your train to the requested speed-limit. Is your speed higher than the requested one , you will derail (speed +15 mph).I'm a lokomotive engineer (freight-trains) with the Belgian Railways (NMBS/SNCB). In Belgium , we use the same system with the speed-limits. In reality you will not derail if your requested speed-limit is a little higher (+ 5 mph)on the switch.
But it is forbidden !!! Even , we can get a penalty for this minor mistake. You will derail if you use only the dynamic break , even the speed is LOWER then the requested speed. To brake a train with freight-cars : use the train brake. You can also damage the locomotive-wheels when you use only the lokomotive brakes to stop a freight-train.Tom. Remove | Alert Edit | Reply | Reply With Quote | Top
ergobob (611 posts)
Sep-22-01, 10:18 AM (EDT) 3. "RE: Operational speed question?" Thanks guys. I was wondering about that. I now feel comfortable going through some of these switches so fast.bob Remove | Alert Edit | Reply | Reply With Quote | Top

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