Remotely Controlled Taita

In 2013 a plan to completely re-signal Taita was abandoned. However some changes were made to the interlocking to reduce delays. The changes were made on Monday 21 July 2014 when Train Control assumed remote control of the existing interlocking.

On this page I describe the original scheme plan and what was commissioned.

It is not possible to determine how an interlocking will behave by studying the S&I diagram. Either the interlocking must or operated or the circuit prints studied. I do not have these privilages for the remotely controlled Taita so the information for Taita post July 2014 may be incomplete or incorrect. Some of the information is based on second hand comments.



Taita 125 signal

Taita 125 Down Outer Home controlled signal at Pomare was converted to Stop & Proceed intermediate signal 2185 when the Taita panel closed in July 2014. A controlled signal has not been needed here since the loop was lifted in 2000.




Scheme Plan 2012

In late 2012 copies of the scheme plan were circulated to staff. A computer based interlocking controlled from Train Control in Wellington was to be installed.

Control of Interlocking.  Train Control.

Up Main.   402 signal changed to a double unit signal to provide a medium speed signalled route from the up main to the down main platform.

Existing controlled signal 31 Up Starting changed to automatic operation signal No. 2110.

Down Main.  401 signal relocated south and a "warner" speed signal added to even out headways and allow a signalled movement up to 407 at "Warner" speed while a simultaneous movement through 451 crossover takes place.

Existing controlled signal 135 down outer home changed to automatic operation signal No. 2185




2014 Budget Plan

The panel was closed on 18th July 2014 and the existing interlocking remotely controlled from Train Control in Wellington. There were some changes to reduce train delays.

layout

135 Down Outer Home controlled signal was converted to stop and proceed intermediate signal 2185 when the Taita panel closed in July 2014. A controlled signal has not been needed here since the loop was lifted in 2000.

134 Down Home An A-light was installed on 134 Down Home signal. This will allow trains to be signalled into the long section between 134 and 126 signals. The original plan (as part of a complete re-signalling) was to move 134 signal towards the platform and installed a Warner route.

Signal Request Button. The Train to Reverse button has been replaced with a Signal Request button.

Storage Road is now track circuited. The signalman could look out the window to check if the siding was occupied; the Controller in Wellington does not have that luxury.

Up Trains to Down Platform. 75 points did not become free until a terminating train had arrived at the Down platform, often delaying a closely following Upper Hutt service. 75 points will now release earlier.

Approach/Back Locking I have seen some evidence which suggests that modifications have been made to reduce delays due to the way approach locking   is configured at Taita. However I have no hard evidence so will not comment further.




Last Updated: Sunday 20th July 2014

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