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St Albans South - Works in 2016

Signalling on heritage railways

Re: St Albans South - Works in 2016

Unread postby Mike Hodgson » Thu Dec 8, 2016 7:16 pm

An operational box would use rather more robustly constructed contacts to work electric locks on levers etc, and the wiring would also be much more substantial, not only because of the safety critical nature of their circuitry but also because of such concerns as resistance to rodent attack.
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Re: St Albans South - Works in 2016

Unread postby John Webb » Thu Dec 8, 2016 8:40 pm

Mike Hodgson wrote:An operational box would use rather more robustly constructed contacts to work electric locks on levers etc, and the wiring would also be much more substantial, not only because of the safety critical nature of their circuitry but also because of such concerns as resistance to rodent attack.

We're only feeding a few volts into our computer, so standard microswitches are quite adequate for our needs.

While we've recently experienced rodent attack in the garden, we've kept the box clear of such problems. We only have the one wire to our demo signal in the garden, and that runs through a 12mm hole, unlike operational boxes which have a large gap at ground level for the greater number of wires and point rods. We have a rather nice model cat upstairs - which gives us a reason to explain to our visitors why many boxes had a cat!
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Re: St Albans South - Works in 2016

Unread postby davidwoodcock » Thu Dec 8, 2016 9:44 pm

Although a rat couldn't get through a 12mm hole (at least not without putting some effort into enlarging it), a mouse almost certainly could. Fixing a small metal plate, with hole drilled in it just large enough for the wire itself, over the hole might be a worthwhile precaution.
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Re: St Albans South - Works in 2016

Unread postby John Webb » Sun Dec 11, 2016 7:14 pm

The final Open Afternoon of 2016 at St Albans South today saw 28 visitors on a pleasant sunny and dry afternoon. The total number of visitors this year was 2,165 - a couple of hundred down on the 2015 total, but quite reasonable.

It will be interesting to see how 2017 goes with some significant changes, particularly to our extended opening days!
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Re: St Albans South - Works in 2016

Unread postby John Webb » Wed Dec 28, 2016 10:06 am

The work on the roof finials (see post on previous page) appears to have been successful - recent rain left not a drop on the floor upstairs.
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