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Train speed calculation

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John Bush

October 31, 2014 08:22PM

Registered: 16 years ago
Posts: 1,606

On another thread a question was raised about how to figure out speed without a speedometer. One way is to time the mile posts. At 60 mph it takes a minute to go a mile. At 10 mph it takes 6 minutes.
Another way is by counting rail joints. If you are on 30' rail the number of joints in 20 seconds is the speed in miles per hour. With 33' rails you count 22.5 seconds. With 39' rails you count for 26.6 seconds. It is surprisingly easy to do.

John Bush

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Subject	Author	Posted
Train speed calculation	John Bush	October 31, 2014 08:22PM
Re: Train speed calculation	RichB	October 31, 2014 08:57PM
Re: Train speed calculation	crackerjackhoghead	October 31, 2014 09:04PM
Re: Train speed calculation	John Bush	October 31, 2014 09:05PM
Re: Train speed calculation	RichB	October 31, 2014 09:16PM
Re: Train speed calculation	Chris Walker	October 31, 2014 11:56PM
Re: Train speed calculation	RichB	November 01, 2014 07:39AM
Re: Train speed calculation	christopher king	November 01, 2014 08:19AM
Re: Train speed calculation	Etrump	November 01, 2014 09:08PM
Re: Train speed calculation	crackerjackhoghead	October 31, 2014 09:01PM
Re: Train speed calculation	John West	October 31, 2014 09:20PM
Re: Train speed calculation	RichB	October 31, 2014 10:03PM
Re: Train speed calculation	Chris Walker	October 31, 2014 11:51PM
Re: Train speed calculation	74ford	November 01, 2014 11:44PM
Re: Train speed calculation	philip.marshall	October 31, 2014 11:20PM
Re: Train speed calculation - this comes in handy	Gavin Hamilton	November 01, 2014 12:24AM
Re: Train speed calculation	Kelly Anderson	November 01, 2014 05:45AM
Re: Train speed calculation	jim pallow	November 01, 2014 06:37AM
Re: Train speed calculation - not even SG	Glenn Butcher	November 01, 2014 08:15AM
Re: Train speed calculation - not even SG	CharlieMcCandless	November 01, 2014 08:32AM
Re: Train speed calculation - not even SG	Russo Loco	November 03, 2014 12:30PM
Re: Train speed calculation-telegraph poles	trainrider47	November 01, 2014 08:31AM
Re: Train speed calculation-telegraph poles	RDannemann	November 01, 2014 09:53AM
Speeding 844	John West	November 01, 2014 10:31AM
Re: Speeding 844	crackerjackhoghead	November 01, 2014 02:24PM
Re: Speeding 844	Tom Moungovan	November 02, 2014 05:40AM
Re: Speeding 844	Russo Loco	November 03, 2014 12:12PM
Re: Train speed calculation-telegraph poles	jim pallow	November 01, 2014 02:53PM
Mile post measurements - Train speed calculation	dougvv	November 01, 2014 09:59AM
Re: Mile post measurements - Train speed calculation	Jim Grigsby	November 01, 2014 11:55AM
Re: Mile post measurements - Train speed calculation	J.B.Bane	November 01, 2014 01:18PM
Re: Train speed calculation	BobHuddleston	November 01, 2014 02:51PM
Re: Train speed calculation	BobHuddleston	November 01, 2014 02:53PM
Re: Train speed calculation	jim pallow	November 01, 2014 05:03PM
Re: Train speed calculation	dougvv	November 01, 2014 06:50PM
Re: Train speed calculation	J.B.Bane	November 01, 2014 07:55PM
Milepost 0 and negative mileage (was Re: Train speed calculation)	philip.marshall	November 01, 2014 09:10PM
Re: Milepost 0 and negative mileage (was Re: Train speed calculation)	george pearce	November 02, 2014 07:32AM
mile posts	dougvv	November 01, 2014 09:20PM
Fence posts	hank	November 02, 2014 09:55AM
Re: Fence posts	edm3rd	November 03, 2014 01:39PM
listen to the Dispatcher	V&Ter	November 03, 2014 02:10PM
Re: Train speed calculation	John C	November 05, 2014 10:49AM
Re: Another method ofTrain speed calculation	John Hewlett	November 29, 2014 12:54PM
Re: Train speed calculation	John C	November 29, 2014 06:08PM
Re: Train speed calculation	Chris Walker	November 29, 2014 07:06PM
Re: Train speed calculation	dougvv	November 29, 2014 10:26PM
Re: Train speed calculation	jim pallow	November 30, 2014 06:32AM

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488 stops for water at Los Pinos tank on closing day Oct. 1979. Photo courtesy Don Richter

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