railroadjj wrote:Well, there are two different types. Standard Range which gets you down to I believe 10 or 15, and then you have the extended ranged which will bring you to stop.
Noooo. First, there are D.C. and A.C. locomotives. D.C. locomotives have standard or extended range dynamic brakes. A.C. do not have the feature as their dynamic brakes are controlled quite differently. With D.C. locomotives dynamic brakes will not stop a train unless the train is going upgrade or is on perfectly level track, and no one cares within +/- a mile or so where the train comes to a stop. A.C. locomotives can stop a train with DB alone, assuming the maximum braking effort provided by the locomotives is sufficient. But the engineer still generally applies some train air or independent brakes for fine control as Wabash pointed out.
For D.C. locomotives, as speed falls (the traction motor turns at a slower speed) the voltage falls, and thus braking effort diminishes (P = I2 * R). Standard dynamic brakes have a designed speed at which maximum braking effort occurs; generally around 20 mph. From 20 to 0 mph braking effort goes to zero proportionately. Extended range uses contactors to short out sections of the dynamic brake grid step-wise in order to decrease the resistance of the grid down to about 7-8 mph. Below that speed, dynamic braking effort goes to zero proportionagte with speed, just as with non-extended range dynamic brakes. (There was apparently an option to obtain extended range brakes that would decrease the minimum speed for maximum effort to ~ 3-4 mph, but I don't if any railroad ever bought it; I've never seen it on a locomotive.)
Scroll to the bottom of the page linked below for a graph that shows braking effort vs. speed for an A.C. locomotive and a D.C. locomotive equipped with extended range DB:
S. Hadid
Guilford350 wrote:QUOTE: Originally posted by trainfinder221. Why does not anyone ever think of using the Dynamic Brake?You can't fully stop a train using dynamic brakes but they will get you down to about 10-12 Mph which, then, you could probably jump off safely.But hey, afterall its just a movie.
QUOTE: Originally posted by trainfinder221. Why does not anyone ever think of using the Dynamic Brake?
well i wonder what im doing differant to stop my train when using dynamic brakes? I seem to stop and then apply independant to hold it. I use dyanamic 98% of the time to stop my train in the winter time.
rrnut282 wrote:What I like is how they ignore the fact of the "deadman control" when the engineer is "incapacitated", or better yet, the engineer goes on when communication is lost, etc...
trainfinder22 wrote:1. Why does not anyone ever think of using the Dynamic Brake? 2.Even Steam engines has some form of Dynamic Braking 3. When cars are cut loose the brakes always snap on not off as the air pistons seperate the brakes
chad thomas wrote: TheAntiGates wrote:What did you guys think of the movie "Tough Guys"?http://entertainment.msn.com/movies/movie.aspx?m=2041It seemed pretty believable to meOne of my all time favorites (and not just because of the trains either). Some great shots of 4449 with Doyle himself at the throttle. It was filmed around Taylor yard in LA and on the old Eagle Mountain mine railroad north of the Salton Sea.
TheAntiGates wrote:What did you guys think of the movie "Tough Guys"?http://entertainment.msn.com/movies/movie.aspx?m=2041It seemed pretty believable to me
One of my all time favorites (and not just because of the trains either). Some great shots of 4449 with Doyle himself at the throttle. It was filmed around Taylor yard in LA and on the old Eagle Mountain mine railroad north of the Salton Sea.
I read that Doyle was shown at the throttle of 4449 because it was easier to make him an actor (he had a line or two) and pay dues to the Screen Actors Guild than to try to teach some dues-paying actor how to run a steam locomotive.
lfish wrote:I always sort of liked the Gene Wilder/Richard Pryor comedy, "Silver Streak," shot with VIA equipment. The interior of the train looked like everything an Amtrak train should but doesn't, and when it comes to the inevitable runaway scene, there IS a deadman's pedal (a heavy tool box holds it down) and the brakes on the passenger cars DO set when the coupling is broken.
Did you also notice that the engineer was on the wrong side of the engine??
Dick
Texas Chief
The Atomic Train was the last runaway I wanted to watch. Im sorry I did.
I dont do runaways much these days, Ive survived a few in trucking. (And no, no ramps neither)
For 30 years my hobby was working as a volunteer auto racing official and track worker. Don't get me started on racing movies. Only "Le Mans" and "Grand Prix" are accurate. And TV shows with a racing theme are uniformly horrible.
There was one "Quincy" that was particularly bad, but "Quincy" was noted for that in all fields. Quincy once showed a scene at a general aviation airport that was supposed to be on Long Island, NY. There was a line of palm trees clearly visible in the middle distance.
Jack
Was there two weeks ago doing some research, and yes, the two locomotives are still there. I met and talked with the trainman who helped set up the wreck. His story is an interesting one. They had set explosives under the tracks to get the locomotives to roll. The charges were encased in PVC pipes. Well, the Hollyweird greensmen saw the white pipes on the ground and covered them up with dirt and ballast. This had the effect of "shaping" the explosion, so that the engines didn't roll, but derailed. Nobody wanted to do a second take, and my GSMR trainman was really disappointed at the results...
The locomotives used in the film were brought in by the production company, and GSMR was allowed to strip the engines of useable parts that weren't visible. The shot was done by a third locomotive pushing the first two along, and that was a GSMR locomotive.
Incidentally, the shot of Harrison Ford wandering out of a railroad tunnel was also shot on the GSMR. That particular tunnel was hand cut in the 1880's by state prisoners, and is just west of Dillsboro on the GSMR main. The only "smooth" part of the tunnel is where it collapsed at one point, and it has been blocked and bricked over to make a smooth interior.
It dont work.Danny CliqueofOne wrote:A real Runaway. http://www.cwrr.com/Lounge/Feature/runaway/index.html
CliqueofOne wrote:A real Runaway. http://www.cwrr.com/Lounge/Feature/runaway/index.html
Blue Ridge Front wrote:And how about "The Fugitive" with Harrison Ford when the train crashed into the over-turned bus. It was filmed on the Great Smoky Mountains Railroad in North Carolina and took a lot of work to setup the crash and everything. Been a long time since I've seen it, but it seemed to be fairly realistic.
I just saw it last month. Its all still there.
The track they used to run the train off is now used as a siding by the GSMR.
Take a Ride on the Scenic Line!
QUOTE: Originally posted by blaze the part about the female conductor being clueless isn't too far fetched, a number of conductors have no clue.
QUOTE: Originally posted by fairportfan QUOTE: the controls on that locomotive and how they were on the left instead of the right. Does anyone know if the cab interior that they used was the actual cab of the locomotive seen in the film? Since someone has said that the station is the NorthWestern Madison STreet station (of which i have fond memories from my time stationed at Great Lakes in 1968), could they have used a CNW locomotive or a cab mockup of one (since CNW was a left-hand runner last i heard).
QUOTE: the controls on that locomotive and how they were on the left instead of the right.
QUOTE: Originally posted by trainfinder22 2.Even Steam engines has some form of Dynamic Braking
QUOTE: Originally posted by CliqueofOne A real Runaway. http://www.cwrr.com/Lounge/Feature/runaway/index.html
QUOTE: Originally posted by egmurphy I think the temporary platform built at Washington Union Station was to accomodate all the visitor traffic expected to arrive in Washington by train for the presidential inauguration a few days later (Eisenhower's first term). Here's a link to an account of that runaway and wreck: http://www.dcnrhs.org/union_station/union_wreck.htm Ed
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