Grovenor

Just the sort of publicity that was needed before Rishi made his cancellation decision, a bit late now. But maybe if we get more of the same the message will get through to the next government.

Has the meaning of "deck" changed recently? I don't see any deck in the video just support girders.

Googling found this paragraph for me from an Irish railway standard, so maybe I'm 1Hz out. 🙂

Quote

The transmitter and receiver in the reed FDM system consist of a reed filter and an amplifier. The reed filter is a high-q band-pass filter, which passes only the frequency allocated to the particular channel and excludes all others with a nominal bandwidth of ±0.5 Hz. The selectivity of the reed filters is such that the system can be operated with frequencies as close as 4 Hz; hence a very large number of channels can be accommodated within a small range of frequencies.

It also came up with this video,

2 hours ago, MartinRS said:

Do you mean 3kHz?

No, I meant 3Hz. Not sure of the frequency range now but I think it was in the region of 300 to 600Hz. £Hz spacing would need 318Hz bandwidth. The Track circuits were around the 300Hz mark and had to avoid all the harmonics of 50Hz plus or minus a bit. The tuned reeds had a very tight resonance frequency which allowed for the close channel spacing.

Mostly this is from memory as I no longer have my reference material.

Rotate your photo in something like Microsoft Paint and save it in its new orientation, then upload that file. Its workerd for me anyway.

The tuned reed system was FDM, not TDM. Every one of the 106 channels required a transmitter reed unit and a reciever reed unit, I think the channels were 3Hz apart.

There was also a related reed track circuit system which had a much restricted range of frequencies as it had to avoid any frequency that might be produced by a traction package working on the line.

The servicing yard already has land cleared for it at Euston, no need for another place. 🤨

IMHO, our activity in defence of the shipping in the gulf has two objectives,

1. Show soidarity with the USA, we still want them as friends.

2. Make Sunak and Schapps look good coming up to the election.

4 hours ago, meatloaf said:

Just a heads up, the TXS decoders are now reduced to £45 in the hattons sale

A link to that would be nice, I can't find any.

Cheers

The real question, which Dutch-Traindriver hinted at, is what do you do when the test fails? Especially when, like Wickham Green too you wait until you are going downhill.

Well said Artun, but fleecing the taxpayer for the benefit of a tiny minority seems to be the way our current government works.

They could move back even quicker since they would be able to jump on the first Eurostar. I was just using the keys as an illustration of the absurdity. All it needs is willpower and a bit of cooperation from those involved.

There would be no need of extra sfaff for security and border control etc. They could all be sent down to Ashford along with the passengers.

Just need to be sure someone can find the keys for the mothballed facilitioes. But getting all the relevant parties to agree and act on it would likely take longer than fixing the problem given the beaurocracies involved

While an obvious possibility, could you see the various organisations invlved actually being able to set it up in less than a week.

It would take them that long to find the keys to open up and staff the border posts, just sending the staff dow from St P on the train, unthinkable. 🙂

I have long understood that the fastest regular steam achedules in the US if not the world were the Milwaukee Hiawathas with those magnificent Atlantics. Scheduled running at over 100 mph for 15 years.

1 hour ago, Neil said:

 

From a financial standpoint the 'worthwhile' cost might be higher than commonly imagined. Back in 1997 the D of T put a figure of £860,000 on a human life. I would guess that it's well north of a million by now though I haven't been able to find confirmation of this yet.

The current figures are given in the court judgement we are discussing here.

Looked like this in 1963 at Longbridge.

5 hours ago, Edwin_m said:

I think all scheduled passenger trains now stop (they didn't a few years back) but there are some freight and it is often used for diversions of GWR London-Bristol trains.  

But see

and several other posts, the post from Limpley Stoker that you quoted is far from correct.

The pedestrians should be thankful that the car caught the belisha beacon, a near miss a foot to the right things would have been far worse.

1 hour ago, Limpley Stoker said:

Bradford on Avon crossing is ungated but as it is close to the station the train movements are slow !

 

It shows half barriers on the photo above, and not so close to the station which is some way, ie two road overbridges in between, from the other end of the tunnel.

Normally on the departing line, shunting out onto the arriving line needs extra signallingand/or blocking traffic. Only used if no alternative.

The lead ore we dug out at Broken Hill (Kabwe) was smelted on site and only shipped as lead ingots. Just a thin layer on the wagon floor was a full load, easy to mistake for an empty.

It seems that everyone of these cut and cover green tunnels has a different bespoke design, sometimes more than one over the length of the tunnel. Why could they not all have used the same design and get savings from re-use?

Actually it sounds as though the slip links may be missing from Pugsley's example. The convention with those diagrams and the terminal block is that the wiring to the right between block and lamps is supplied with the signal, the wiring to the left of the terminal block is installed by the technician on site, then the left and right sides of the terminal block are joined by slip links, that allow circuits to be opened as needed for tests etc.

In the absence of the links then connecting all the wiring to the right hand side of the terminal block will get it working as shown.