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Power Operation of Loop Points on NSTR lines

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Power Operation of Loop Points on NSTR lines 05/12/2018 at 17:14 #113848
TUT
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As I understand it, loop points on most No-signaller token (NSTR) lines have been converted to power operation, for example those at Tenby (http://www.railsigns.uk/photos/p_points1/p_points1.html).

What I would like to know is how these points are actually worked.

I understand that the original NSTR system (like RETB) had train operated points that were normally set for the train to enter the loop in the facing direction. In the trailing direction, the train would push the points over and then stored hydraulic pressure would push them back for the next train to pass over them in the facing direction. No signal required, no route setting required, no intervention by the signaller required. Hence there is no signal, just a points indicator.

But I can't find anything about how the power operated loop points are actually moved, set and worked.

Anyone know more?

Last edited: 05/12/2018 at 17:39 by TUT
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Power Operation of Loop Points on NSTR lines 05/12/2018 at 17:37 #113849
Hap
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Link broken.

I thought PSIs were/are signals, there is normally a fixed distant (which is a signal also) for a PSI.

Crianlarich has motorised points for the routes to either Oban or Fort William/Mallaig. operated by the press of a plunger at the end of the platform, then the route/points sets. PSI then displays a Route indication on the theatre box provided with the PSI.

https://www.youtube.com/watch?v=2N89Yhp_t9U

General idea in the link above.

Hap

HAP
Last edited: 05/12/2018 at 17:41 by Hap
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Power Operation of Loop Points on NSTR lines 05/12/2018 at 17:41 #113850
TUT
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Hap in post 113849 said:
Link broken.

I thought PSIs were/are signals, there is normally a fixed distant (which is a signal also) for a PSI.

Crianlarich has motorised points for the routes to either Oban or Fort William/Mallaig. operated by the press of a plunger at the end of the platform, then the route/points sets. PSI then displays a Route indication on the theatre box provided with the PSI.

Hap
Sorry, you're quite right, the link was broken due to my inability to use the Link button I've fixed it now.

I'm sure PSIs count as a kind of signal, what I mean is you have a PSI instead of a more conventional 2/3/4-aspect stop signal like you would normally have at a passing loop.

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