Trentham Signal Panel

The Trentham panel was probably commissioned in November 1954 when a new interlocking came into use. This was about the time the Hutt Valley duplication and electrification reached the station. Trentham is a switch-out signal box. It is switched-in on race days so that trains can be signalled into the Racecourse Platform (loop). When the station is switched-out the junction points are controlled remotely.

The photographs on this page were taken in July 2004. On Waitangi Day 6th February 2007 control of Trentham was transferred from Upper Hutt to the Network Control Centre and the station panel decommissioned. The Last Trentham Signalman was Mr Alan Wickens.

The Trentham local instruction uses the term lever rather than switch. I will follow this convention.

Trentham Panel

Trentham Panel

Note the control panel for the telephone system. The Trentham S&I diagram shows that the station had a telephone to Train Control and a network of local telephones (located next to the signals). The local telephones were switched to Upper Hutt when Trentham was unattended.

I do not have any more information about the Trentham telephone network but, based on what was at Upper Hutt, it is possible that the station also had access to a box-to-box circuit and a service (NZR network?) circuit. A microphone and loadspeaker system may also have been provided.

Trentham Diagram

Trentham signal Panel

The intermediate signals retain their pre-metric (i.e. miles and chains) numbers.

Down intermediate signal 1939 (now 3117) at Wallaceville is shown as a single unit signal. In 1993 it was changed to a double unit signal and the Down Outer Home removed.

Upper Hutt has slot control over signal 23. When Trentham is switched-in lever 23 at Upper Hutt must be reversed before Trentham can clear the signal.

In December 1987 the Camp Road level crossing was closed and a new crossing opened at Sutherland Avenue, approximately 200m south. The Up Home signal was re-located.

The switchlocked Defence siding had been removed by 1993. The switchlock was not released from the Trentham panel.

The Time Release plunger, when depressed and held in for 60 seconds, releases the backlocking on signals 3 and 29 (provided signal levers 3 and 29 are normal).

Trentham Panel Levers And Indications

levers on panel

The Up Departure signals (23A and 23B) are cleared with a single lever (23) - the position of 13 points determining which signal cleared. In contrast, the Down Starting signals (7 & 8) have individual levers.

Signal 24 was a low-speed light giving access to the sidings. For consistancy it was necessary to turn lever 24 before the low-speed button was pressed.

The Block Bells were in use until 1996 or later. The Taita sign could be changed to read Woburn, Petone or Wellington, indicating which box was the next switched-in. This was the station the bell codes were working to.

Note the conventions used with the No 1 lever (switch in/out). To the left the lever is normal and the station is switched-in. To the right the lever is reverse and the station is switched-out.

Levers And Indications In Detail

A close up view of levers and indications on the Petone panel. The levers and indications on this panel are similar to those at Trentham.

47 points are reversed and free - the points will return to normal when the lever is returned to normal.

48 points are normal and locked - they will not move if the lever is moved to the reverse position.

The lever for 77 signal has been turned to the right to clear the signal - the indication shows that the signal has cleared.

The lever for 78 signal is to the left, holding the signal at stop. The Featherston panel did not have the green signal indication lamp.

leveres detail

Last Updated: Wed Feb 14 13:20:19 NZDT 2007

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