Class 66, 66534
Electro-Motive Diesel Inc. Type JT42CWR Class 66 diesel electric locomotive 66534 heads a Freightliner intermodal northbound into Chelmsford Station on the Great Eastern Main Line with Class 90 'Skoda' 90046 behind and along for the ride dead in tow pantograph down.. (probably broken down..;-)
Note the signal L758 and the 45 degree 'feather' junction route indicator above the locomotives at the end of the down line platform (2). This signal is used to control bi-directional workings southbound on the down line.
If the proceed green aspect is shown and the 'feather' route indicator (5 lights at 45° above the signal) is illuminated showing a white aspect this means the crossover points are set for a train to crossover onto the 'up' line just beyond here. More often than not these are used for the weekday 6M53 Chelmsford low level yard to Mountsorrel Quarry aggregate return service and some early morning rush hour Liverpool Street bound trains. Generally trains are held at red before using the crossover to prevent excess speed on the points.
The caged signal device on the left is called a 'banner repeater' and these are positioned when the driver cannot see a forthcoming colour aspect signal. In this case it's for the down signal L717 at the other end of this platform (the up line) during bi-directional workings.
Also note the two bi-directional British Rail Automatic Warning System (AWS) Inductor Ramps in between the rails just in front of the locomotive.
The inductor ramp is an integral part of the AWS which was introduced on British Railways in 1956. AWS will warn the driver about the aspect of the following signal which is generally about 180/185 metres away in either direction. In this instance it is for signal L715 at the end of the down line platform (2). Data about the next signal aspect is sent electromagnetically to the driver as the train passes over the ramp. The inductor contains a magnet and an electromagnet which can denergise the magnet.
If the following signal aspect is green, the electromagnet of the ramp will magnetise and when the train passes over a buzzer will sound in the cab and the drivers AWS warning panel will show black and the driver can proceed as normal.
If the following signal aspect is showing yellow (caution) or red (stop, danger) the electromagnet will denergise the magnet and this will sound an alarm in the cab as the train passes over while the AWS warning panel will show yellow and black. If the driver does not press the cancel button to switch off the alarm within 6 seconds the brakes will be applied and the train will be stopped.
;-)
www.flickr.com/photos/stuart166axe/tags/signalling/
Nice shooting in difficult autumn light by fellow enthusiast David and photograph posted here with very kind permission.
Class 66, 66534
Electro-Motive Diesel Inc. Type JT42CWR Class 66 diesel electric locomotive 66534 heads a Freightliner intermodal northbound into Chelmsford Station on the Great Eastern Main Line with Class 90 'Skoda' 90046 behind and along for the ride dead in tow pantograph down.. (probably broken down..;-)
Note the signal L758 and the 45 degree 'feather' junction route indicator above the locomotives at the end of the down line platform (2). This signal is used to control bi-directional workings southbound on the down line.
If the proceed green aspect is shown and the 'feather' route indicator (5 lights at 45° above the signal) is illuminated showing a white aspect this means the crossover points are set for a train to crossover onto the 'up' line just beyond here. More often than not these are used for the weekday 6M53 Chelmsford low level yard to Mountsorrel Quarry aggregate return service and some early morning rush hour Liverpool Street bound trains. Generally trains are held at red before using the crossover to prevent excess speed on the points.
The caged signal device on the left is called a 'banner repeater' and these are positioned when the driver cannot see a forthcoming colour aspect signal. In this case it's for the down signal L717 at the other end of this platform (the up line) during bi-directional workings.
Also note the two bi-directional British Rail Automatic Warning System (AWS) Inductor Ramps in between the rails just in front of the locomotive.
The inductor ramp is an integral part of the AWS which was introduced on British Railways in 1956. AWS will warn the driver about the aspect of the following signal which is generally about 180/185 metres away in either direction. In this instance it is for signal L715 at the end of the down line platform (2). Data about the next signal aspect is sent electromagnetically to the driver as the train passes over the ramp. The inductor contains a magnet and an electromagnet which can denergise the magnet.
If the following signal aspect is green, the electromagnet of the ramp will magnetise and when the train passes over a buzzer will sound in the cab and the drivers AWS warning panel will show black and the driver can proceed as normal.
If the following signal aspect is showing yellow (caution) or red (stop, danger) the electromagnet will denergise the magnet and this will sound an alarm in the cab as the train passes over while the AWS warning panel will show yellow and black. If the driver does not press the cancel button to switch off the alarm within 6 seconds the brakes will be applied and the train will be stopped.
;-)
www.flickr.com/photos/stuart166axe/tags/signalling/
Nice shooting in difficult autumn light by fellow enthusiast David and photograph posted here with very kind permission.