Terminal protection

Hi,

This is my first post based in the UK so please take into account the possible differences.

When trains enter a terminal station (one with buffer stops), is there any protection given with regard to the signalling and the speed of the trains, over here on the tube we have TETS train entering terminal station.

Del

The speed into a terminal is around 5 mph or less, near the bumper block,there will be a signal set at stop,and a fixed trip arm,
go past the signal,the trip arm will engage the trip valve,dumping the air to the train,stopping it just short of the bumper block.
The train is stopped before getting to that end of track signal.

Backshophoss wrote:The speed into a terminal is around 5 mph or less, near the bumper block,there will be a signal set at stop,and a fixed trip arm,
go past the signal,the trip arm will engage the trip valve,dumping the air to the train,stopping it just short of the bumper block.
The train is stopped before getting to that end of track signal.

Many thanks for the reply. Over here we have had a number of terminal overruns at a slow speed.

Acton Town S5 wrote:Hi,

This is my first post based in the UK so please take into account the possible differences.

When trains enter a terminal station (one with buffer stops), is there any protection given with regard to the signalling and the speed of the trains, over here on the tube we have TETS train entering terminal station.

Del

There are at least 2 signals along the track in a terminal station (some stations have 3 or 4). These are timed signals. This slows the train down considerably as the signal will not clear (turn from red to yellow/amber) under the train is almost right on front of it. These are in addition to the fixed red signal and stop arm located just before the bumper block.

Each signal has an arm ('stop-arm' or 'tripper') at track level that stays raised when the signal is red. It lowers when the signal changes. If the train passes by a red signal that arm comes in contact with a valve lever (called a 'trip-cock') and the emergency brakes are immediate activated.

Allan wrote:

Acton Town S5 wrote:Hi,

This is my first post based in the UK so please take into account the possible differences.

When trains enter a terminal station (one with buffer stops), is there any protection given with regard to the signalling and the speed of the trains, over here on the tube we have TETS train entering terminal station.

Del

There are at least 2 signals along the track in a terminal station (some stations have 3 or 4). These are timed signals. This slows the train down considerably as the signal will not clear (turn from red to yellow/amber) under the train is almost right on front of it. These are in addition to the fixed red signal and stop arm located just before the bumper block.

Each signal has an arm ('stop-arm' or 'tripper') at track level that stays raised when the signal is red. It lowers when the signal changes. If the train passes by a red signal that arm comes in contact with a valve lever (called a 'trip-cock') and the emergency brakes are immediate activated.

Over here before the Moorgate accident some of the terminal stations did not have anything the signal just cleared providing all was in order to do so, some were approach controlled. All stop signals have what you call a stop arm/tripper we call them train stops there are I think 3 types although with the resignalling that has been going on some lines Jubilee/Victoria/Northern do not have train stops that work with signals only fixed train stop that work with track circuit interrupters. There are some local arrangements like trains going to/from the Victoria line to/from the Piccadilly line.

Allan wrote:There are at least 2 signals along the track in a terminal station (some stations have 3 or 4). These are timed signals. This slows the train down considerably as the signal will not clear (turn from red to yellow/amber) under the train is almost right on front of it. These are in addition to the fixed red signal and stop arm located just before the bumper block.

How close must the train be? I've often noticed northbound Franklin Ave trains needing to stop halfway down the platform at Fulton St so that the second-to-last signal clears, meanwhile everyone on board is assuming the train has come to a complete stop.

Kilgore Trout wrote:

Allan wrote:There are at least 2 signals along the track in a terminal station (some stations have 3 or 4). These are timed signals. This slows the train down considerably as the signal will not clear (turn from red to yellow/amber) under the train is almost right on front of it. These are in addition to the fixed red signal and stop arm located just before the bumper block.

How close must the train be? I've often noticed northbound Franklin Ave trains needing to stop halfway down the platform at Fulton St so that the second-to-last signal clears, meanwhile everyone on board is assuming the train has come to a complete stop.

Depends on what the signal is timed for, and how fast the operator comes into the station. If the operator enters the timed block at the proper speed, the signal should clear before the train gets to it. At certain terminals, like Franklin ave (because of the shorter platforms), I would think that it is normal to set the timer to a very low speed to force the train to come to a stop at the signal for a few seconds before it clears.