Two signs I've oft wondered what they mean.....

[whole diary]

[MrC]

Lots of new transmitters are appearing alongside the railway

As a complete aside a new GSM-R^▸ (Global System for Mobile communications - Railway. A simple mobile phone that has been fitted to the turbos to allow them to operate on lines that are not covered by the cab secure radio (CSR). This allows the Network Rail control centre to send simple STOP messages to the driver or the driver to contact the controller in emergency only. When this system is in operation a guard must be provided when in passenger operation.) mast was recently installed to the north of Battledown flyover (by Worting Jcn west of Basingstoke). I just happened to glance at it today and noticed that some enterprising soul has tagged one of the antenna boxes at the top of the mast with black paint. Whether the antenna was tagged on the ground and then installed, or the tagger climbed the mast I've no idea but it's a hell of a long way off the ground!

[JayMac]

All this is very entertaining but clearly not the real reason.

The "Switch On GSM" sign at Oxford relates to the Go Slow Motor fitted to all trains operating Cotswold services. When trains promising 'High Speed' or even 'Turbo' operation were first introduced to the line, users were concerned that the essential nature of the Cotswold service could be compromised. As a result, a Go Slow Motor was fitted to ensure slower running. If, despite this, a train is making good progress, the GSM's emergency mode will kick in at certain predefined points (e.g. Evesham and Ascott) to delay the train by an arbitrary amount.

GSM is not fitted to all stock that can operate on the Cotswold line. For example, the Class 180 'Andante' trains are capable of delaying themselves by such expedients as catching fire, doors jamming open/shut, etc. etc. Consequently no assistance is required from the GSM.

I hope that's cleared it up.

I think that deserves some sort of prize for the funniest post in recent months..... top work Richard. I laughed so hard I very nearly followed through!!!!!!