Coupling in motion?

General discussion about railroad operations, related facilities, maps, and other resources.

Moderator: Robert Paniagua

Coupling in motion?

Postby CLamb » Sat Dec 09, 2017 2:42 am

Has there been any experimentation on coupling of two trains in motion? I'm imagining something like one train in motion and another coming up behind it and coupling on.
CLamb
 
Posts: 206
Joined: Fri Nov 18, 2005 11:29 pm
Location: Scotch Plains, NJ

Re: Coupling in motion?

Postby DutchRailnut » Sat Dec 09, 2017 6:22 am

no matter how you tried both trains would end up with emergency braking . trains are designed so two control stations can never be active at same time.
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer
User avatar
DutchRailnut
 
Posts: 21588
Joined: Thu Mar 11, 2004 8:02 pm
Location: released from Stalag 13

Re: Coupling in motion?

Postby radio » Sat Dec 09, 2017 8:15 am

If the trains were only coupled mechanically, how would a control station know to initiate emergency braking? What the OP describes sounds similar to the Crazy 8's incident in 2001, which the movie Unstoppable was based on.
radio
 
Posts: 7
Joined: Fri May 19, 2017 8:15 pm

Re: Coupling in motion?

Postby DutchRailnut » Sat Dec 09, 2017 3:47 pm

Mechanically coupling yes it can be done , but to stop a train the air has to be connected too.
if it were a automatic coupler the air would connect, but so would control .
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer
User avatar
DutchRailnut
 
Posts: 21588
Joined: Thu Mar 11, 2004 8:02 pm
Location: released from Stalag 13

Re: Coupling in motion?

Postby CLamb » Sat Dec 09, 2017 11:19 pm

There are automatic couplers which make all connections automatically. I'm assuming the control system would be adapted to allow for such an event. It sounds like no one here has heard of it being tried.
CLamb
 
Posts: 206
Joined: Fri Nov 18, 2005 11:29 pm
Location: Scotch Plains, NJ

Re: Coupling in motion?

Postby DutchRailnut » Sun Dec 10, 2017 3:57 pm

it would be a no no under most railroad guidelines to have more than one control station active.
Only one who would support such insane idea would be ISSIS.
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer
User avatar
DutchRailnut
 
Posts: 21588
Joined: Thu Mar 11, 2004 8:02 pm
Location: released from Stalag 13

Re: Coupling in motion?

Postby CLamb » Mon Dec 11, 2017 12:36 am

DutchRailnut wrote:it would be a no no under most railroad guidelines to have more than one control station active.
Only one who would support such insane idea would be ISSIS.


Of course, no railroad allows it yet. It hasn't been developed. It's no more insane than powered a ship by building a bonfire under her decks.
CLamb
 
Posts: 206
Joined: Fri Nov 18, 2005 11:29 pm
Location: Scotch Plains, NJ

Re: Coupling in motion?

Postby BR&P » Sun Jan 14, 2018 12:15 am

While "thinking outside the box" is fine, I'm not sure exactly what you would hope to accomplish, nor how exactly you propose it would work.

As stated above, physical coupling in motion is possible now, but not the braking nor propulsion/control systems. Unless you can conceive of a radicaly adaptive method, the cost of changing the nation's rail equipment to such a different design would far, far outweigh any advantages.
BR&P
 
Posts: 3814
Joined: Fri Mar 12, 2004 7:58 pm

Re: Coupling in motion?

Postby ExCon90 » Sun Jan 14, 2018 4:06 pm

An interesting engineering challenge would be how to arrange for PTC to permit a train to get close enough to a preceding to train to couple to it while both trains are in motion.
ExCon90
 
Posts: 3746
Joined: Thu Sep 18, 2008 1:22 pm

Re: Coupling in motion?

Postby Wayside » Sun Jan 14, 2018 5:42 pm

I don't understand what the advantage would be to coupling while in motion.
Definition: Fixed Signal -- A signal that has been repaired
User avatar
Wayside
 
Posts: 102
Joined: Sun Jul 30, 2017 9:00 am
Location: The First State

Re: Coupling in motion?

Postby DutchRailnut » Sun Jan 14, 2018 6:04 pm

There is non, you would still require two crews, be it at last stop or at jct .
If Conductors are in charge, why are they promoted to be Engineer???

Retired Triebfahrzeugführer
User avatar
DutchRailnut
 
Posts: 21588
Joined: Thu Mar 11, 2004 8:02 pm
Location: released from Stalag 13

Re: Coupling in motion?

Postby CLamb » Mon Jan 15, 2018 1:49 am

Wayside wrote:I don't understand what the advantage would be to coupling while in motion.


There would be no need to slow down to add or remove cars. Consider an MU commuter train making multiple stops. Instead of stopping to pick up passengers at each station a car could be pre-boarded and then join the train en route.
CLamb
 
Posts: 206
Joined: Fri Nov 18, 2005 11:29 pm
Location: Scotch Plains, NJ

Re: Coupling in motion?

Postby Wayside » Mon Jan 15, 2018 11:43 am

Interesting concepts. Many things would have to change in order for them to become reality with today's equipment and practices.
Definition: Fixed Signal -- A signal that has been repaired
User avatar
Wayside
 
Posts: 102
Joined: Sun Jul 30, 2017 9:00 am
Location: The First State

Re: Coupling in motion?

Postby talltim » Tue Jan 16, 2018 5:46 am

In the UK and possibly elsewhere, they used to have slip coaches, which were uncoupled as an express came towards a station and were braked to a halt in the platform while the train carried on non-stop.
https://en.wikipedia.org/wiki/Slip_coach
Tim David
User avatar
talltim
 
Posts: 184
Joined: Wed Jun 08, 2011 6:16 am
Location: Chesterfield, UK


Return to Operations, Facilities, Maps and Resources

Who is online

Users browsing this forum: No registered users and 2 guests