Other formats

    TEI XML file   ePub eBook file  


    mail icontwitter iconBlogspot iconrss icon

The New Zealand Railways Magazine, Volume 1, Issue 7 (December 15, 1926)

Modern Shunting Methods — Part VI.: Dimensions and General Arrangement of Marshalling Yards (Contd.)

page 42

Modern Shunting Methods
Part VI.: Dimensions and General Arrangement of Marshalling Yards (Contd.)

Sorting Sidings.—These sidings have to be arranged so that wagons can be conveniently taken from any of the marshalling roads, sorted into train order and placed in the departure sidings. In some yards certain marshalling roads are set aside for this purpose, so that they can be utilised for both marshalling and sorting, as occasion demands. Another plan is to have a special “grid” of short sidings, or a number of short dead-end sidings. Here again, however, the nature of the traffic, and the purpose for which the yard is constructed, decide the method to be employed. There are some yards which require no sorting roads whatever; the first marshalling movement splits up the trains in such a way that each marshalling road holds a train ready to depart.

Storage Roads.—Nearly all yards require accommodation for wagons standing over—loaded wagons awaiting removal instructions, empties not required, and empties being concentrated for storing purposes.

In this country storage usually applies to stock trucks or frozen meat wagons put aside during the slack season. If the yard is adjacent to a port town, facilities for shipping requirements are necessary, in order that the ordinary work of the yard shall not be interfered with by congesting the “working” sidings.

If possible, it is a good plan to arrange the storage roads in such a way that they can be used as arrival, departure, and marshalling roads, as required. This increases the utility of the yard in general, particularly when derailments, or other disturbing factors, render normal working impossible. Dead-end roads for storage should be avoided if possible, particularly when various types of wagons are stored together, for, more often than not, the particular wagons required are nearest the stop blocks, thus necessitating undue shunting movements.

Subsidiary Requirements.

Exchange Sidings.—These are provided at yards where trains are required to enter to pick up and set down wagons with the least possible delay. For really rapid operation three roads are required for these purposes.

1. For the train itself.

2. For concentrating the wagons to be picked up.

3. For shunting the wagons that are taken from the train.

With these facilities an exchange can be made in five minutes. Such sidings have not yet become necessary here, as the long-distance trains are not frequent enough to permit of the holding over of sufficient “long distance” traffic to make good train loading for these trains, therefore, the present through trains are continually changing their loads, an action which necessitates remarshalling at numerous points. As the traffic grows, however, the need for exchange sidings will undoubtedly arise, as they effect a considerable economy in goods train operation generally. Exchange sidings are also used for changing over engines and crews at the end of a division, and—in the case of through trains between two separate railway companies—for the changing of engines, crews, and brake vans, examining trains, checking wagons, etc.

Loco Depots and “run-round” Roads.—Most marshalling yards are situated at the end of a locomotive division. It is therefore necessary to provide a locomotive depot at a convenient point in the yard. Its position is most important in view of the present day costs per engine hour. Every possible facility should be given to permit of the immediate release of engines arriving with trains so that they can proceed to the depot, or to the departure roads, without delay. The latter applies especially to engines working short trips, or transferring wagons from one yard to another. Furthermore, ready access to departure roads from the locomotive depot or arrival roads is essential in order to prevent delays to engines after being turned over to the Traffic Branch, or when moving from the reception sidings to the departure sidings. To facilitate movements “run-round” roads are provided where possible, these roads being kept for engine purposes only.

The recognition of the necessity for getting the utmost out of the locomotive has led many railways to go to the expense of providing “fly over” or “burrowing” junctions solely for the purpose of preventing delays. It can be readily understood that, if there is some doubt as to the possibility of an engine getting to the depot to turn and return within a certain time to take up the running of another train, either the timetable has to be altered or another engine used.

page 43

Any alterations to the timetable have such farreaching effects that it is usually preferable to obtain another engine. Result—increased operating costs!

No better example could be given of the necessity for close co-operation between the yard designing engineer and the operating officer than this case of providing unimpeded movement for train engines in the yard. The greatest wastage in locomotive working takes place at terminal yards, and any reasonable expenditure to reduce this wastage is justified.

Wagon Repair Depots.—The most suitable position for a wagon repair depot is obviously where all concentration of wagons takes place. It is not necessary to have this depot in the yard itself, but it should be adjacent. In any case it is advisable to place it well away from running roads or sidings where wagons are liable to be moving. One or two roads in the marshalling yards are assigned to crippled wagons and they are taken from there to the repair depot as required.

Type of exchange yard constructed by the British Army in France during the war to facilitate exchange of traffic between the British and French railway authorities. (Note the triangle to enable engines to turn as they pass from one train to another)

Type of exchange yard constructed by the British Army in France during the war to facilitate exchange of traffic between the British and French railway authorities. (Note the triangle to enable engines to turn as they pass from one train to another)

Weighbridge Road.—This is usually a road set apart from the siding groups in order that the weighbridge and necessary buildings are not too near running roads or sidings. Sometimes capstans are used so that weighing can take place at any time without interfering with the work of the yard engines. In some gravity yards there is no weighbridge siding, the wagons being weighed as they pass over the main shunting lead to the marshalling yard. With a modern weighbridge it is quite a simple matter to weigh the wagons on the move.

Brake Van Road.—Brake vans are collected on this road from the arriving trains. Here they are inspected, have lamps trimmed, etc., and are otherwise made ready for placing on outgoing trains. One of the outside marshalling roads can be conveniently used for this purpose. A deadend road is not recommended.

Refrigerator Car Service.—The necessity for special roads for this work arises only in countries where extensive icing of freight cars takes place. These sidings are necessarily alongside the apparatus for icing or inspecting refrigerator cars or wagons. With the use of the latest motor lorries with self-raising platforms, icing can be done alongside in the ordinary way—a much more convenient arrangement than having to push wagons past the icing stage or platform. The sidings do not usually form part of the main yard but are placed in the most convenient position as circumstances warrant.

Transhipping Sidings.—The large yards, where concentration of wagons from various directions takes place, are usually taken advantage of for page 44 transhipping purposes whether there is a local goods shed or not. The re-adjustment of loads which have moved during transit can also be conveniently carried out in the transhipment shed.

Wagons for transhipment are collected on certain roads in the marshalling yard and taken to separate sidings adjacent to the transhipping sheds. The sheds and the sidings should be placed in such a position as to ensure easy access by the yard shunting engine. Wagons should be pushed direct into the siding, that is to say, running-round or slip shunting should be eliminated.

Wagon Cleaning Sidings.—These sidings usually apply to stock wagons, and in countries where the government takes stringent methods to prevent cattle disease, a most elaborate system for cleaning wagons is essential. These sidings, by reason of their nature, are set well away from the main body of the yard.

Main Line Alteration
Smart Work at Frankton Junction

In connection with the improvements and enlargement of the Frankton Junction railway station it was recently necessary to put in a new “scissors” crossing 180 feet in length, and weighing 50 tons, on the main line at the north end of the station.

In order to expedite the work, the “scissors” crossing was built alongside the main line where it was to be put in. Skids were placed under it and the ballast pulled out between the sleepers where the line was to be broken and everything prepared so that the job could be rushed directly the 2.30 p.m. Frankton-Auckland train cleared tablet at 2.40 p.m. A seven-ton steam crane was used to pull the crossing over from the middle, and double purchase blocks were used at each end of the crossing. Directly the track had been broken and cleared for the reception of the crossing it was pulled into position, the actual time taken to join up at each end being 20 minutes. Then the skids and packing had to be removed. This took longer on account of the lifting and awkwardness of the work, nevertheless, it was done within 30 minutes, making 50 minutes in getting the crossing into position so that it could be used. Packing of the sleepers had to be done afterwards, but there was no occasion to hold up the passage of trains and for all practical purposes the job was put through in 50 minutes.

There were 2 gangs engaged consisting of 30 men in charge of Ganger C. Chapman. Mr George Rayson, Inspector of Permanent Way supervised the work.

Mr. W. T. Langbein, Assistant District Engineer in charge of the yard alterations at Frankton Junction, and Mr. R. A. Abel, Signal Inspector, were present. The work went with a swing and the change over reflected credit on the organisation of the responsible officers and the efficiency of the men under them.

To be capable of steady friendship or lasting love, are the two greatest proofs, not only of goodness of heart, but of strength of mind.

William Hazlitt.