Working Timetable (WTT) Page

A Sample Page from a Working Timetable

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Introduction

To show railway staff how the train service will operate and where the trains will start and finish, a timetable must be drawn up.  This is not the one the passengers see, it is a detailed one for staff.  It shows all details of all train movements, including empty moves and times in and out of depots.  It shows each train or trip identity and intermediate times for some, if not all stations.  Here is a sample, showing the start up of the Forest Line service in the early morning.

Train-
Trip No.
                1-2 2-2 6-2 3-2 8-2 4-2 7-2 1-4 2-4 5-2 9-2
Notes                 Ety. Ety.                  
Ash                 05:40 05:50   06:00   06:10 06:17 06:23 06:29 06:35  
Ash Depot                                       
Elm                 05:44 05:54 06:02 06:05½ 06:13 06:15½ 06:22½ 06:28½ 06:34½ 06:40½  
Elm Sdgs                                       
Oak                 05:47 05:57 06:05½ 06:09 06:19½ 06:19 06:26 06:32 06:38 06:44 06:47½
Oak Sdg                                       
Plane                 05:52½ 06:02½ 06:11 06:14½ 06:25 06:24½ 06:31½ 06:37½ 06:43½ 06:49½ 06:53
Platform                 1 1 1 1 1 2 1 2 1 2 1
To Form                 06:00 06:09 06:16 06:22 06:28 06:33 06:38 06:43 06:47 06:51½ 06:55
                                             
Train-
Trip No.
1-1 2-1 3-1 4-1 6-1 7-1 1-3 8-1 2-3 5-1 6-3   3-3 8-3 4-3 7-3   9-1 1-5
Notes Ety. Ety. Ety. Ety. Ety. Ety.   Ety.   Ety.               Ety.  
Plane              06:00   06:09   06:16   06:22 06:28 06:33 06:38     06:43
Oak Sdg                                    06:44½    
Oak              06:05½   06:14½   06:21½   06:27½ 06:33½ 06:38½ 06:43½   06:45½ 06:48½
Elm Sdgs         05:55     06:06½                           
Elm       05:57   06:09 06:08½ 06:18   06:25   06:31 06:37 06:42 06:47     06:52
Ash Depot 05:31 05:41 05:52 06:01   06:09       06:26                    
Ash 05:34 05:44 05:55 06:04   06:12 06:14½ 06:13 06:23½ 06:29 06:30½   06:36½ 06:42½ 06:47½ 06:52½     06:57½
Platform 1 1 1 2 1 2 1 1 2 1 2   1 2 1 2   1s 2
To Form 05:40 05:50 06:00 06:10 06:02 06:17 06:23   06:29 06:35 06:40   06:45 06:49 06:53 06:57   06:47½ 07:01

The timetable is displayed in easy to read format.  The two directions of running appear one above the other.  Each trip is headed by the trip number.  Empty trains have their times in italics, the platform numbers are included and the letter "s" is added to any platform where the crew has to "step back".  This will occur for any train with a turnround of three minutes or less.  A number of things have to be considered in planning the timetable.  For example, at each terminus, the platform use must be planned to avoid conflicts between arriving and departing trains as they move over the crossovers.  Some trains entering service have to reverse in the platform at Oak and Elm  and this must be done without delaying following trains.  As the service builds up towards the morning peak, the turnround times will reduce at the terminals and, when all 11 trains are in service, it will be down to two minutes. 

Note that all the trains are allocated a number and that it can be helpful if this number changes with each trip.  This is useful during disruptions of the service and to track car mileage.  Usually, crews are allocated a number as well and this may also be displayed in the timetable against the trip.

Timetables can be written in tabular form or as graphs.  Where there is mixed traffic with varying train speeds, the graph form is easier to prepare and use.  Both types are nowadays generated by computer.  This has replaced the old manual system of using a pencil and eraser - there were always a lot of alterations to do.

Diagrams

The term "diagram" is used in UK train management to mean "working out what each train does each day" or a "train duty".  The diagram shows where and when each train starts and where and when it finishes each day and what it does in between.  When the timetable is completed, each trip shown in the timetable is allocated a train.  The train or the trip, is given an identity and then a list of trips drawn up for each train.  Everything the train does is listed, including empty trips to and from depots.  Here is a small sample:

Train 1 Train 2 Train 3 Train 4
05:31 Ety. Ash Depot - Ash 05:41 Ety. Ash Depot - Ash 05:52 Ety. Ash Depot - Ash 06:01 Ety. Ash Depot - Ash
05:40 Ety. Ash - Plane 05:50 Ety. Ash - Plane 06:00 Ety. Ash - Plane 06:10 Ety. Ash - Plane
06:00 Plane - Ash 06:10 Plane - Ash 06:22 Plane - Ash 06:33 Plane - Ash
06:23 Ash - Plane 06:22 Ash - Plane 06:45 Ash - Plane 06:53 Ash - Plane
06:43 Plane - Ash 06:45 Plane - Ash 07:06 Plane - Ash 07:09 Plane - Ash etc. etc.

Rolling Stock Pages Summary

The diagrams can also be consolidated into a "rolling stock working summary" which lists the train numbers and where each train starts and finishes each day, as follows:.

Train No. Start AM Finish AM Start PM Finish PM Finish Night
1 05:31 Ash 09:17 Ash 14:54 Ash   23:11 Ash
2 05:41 Ash     18:27 Ash  
3 05:52 Ash     19:34 Elm  
4 06:01 Ash       00:14 Elm

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