Balloon Loop Article Index for
Balloon
Website Links For
Balloon
 

Information About

Balloon Loop





USE

Balloon loops can be useful for passenger trains, and ''unit'' freight trains, such as coal trains.

Balloon loops do not include track layouts where combinations of junctions allow a train reversal, where this reversal is not regularly used.

In some transport simulators (eg: Transport Tycoon Deluxe , 1996 but still played worldwide), Balloon Loops are referred to as RoRo stations or Roll On, Roll Out. They are frequently used at busy stations.


EXAMPLES


Passenger




Freight


New South Wales, Australia



HISTORY


Balloon loops first appeared in large numbers in the 1960s when the modernising British Rail introduced so-called ''merry-go-round'' coal trains that operated without shunting from mines to power stations and back again, around the clock.


DISADVANTAGES


The only real disadvantage of a balloon loop is that it needs a lot of space to build, and even so, the curves can be very sharp. The very sharp 180 m radius curves on the Olympic Park balloon loop cause noise, wear and tear on both the wheels and rails.


ADVANTAGES


The advantages of a balloon loop include -
  • smooth operation.

  • trains can arrive in any free platform, while another train is leaving any platform.


If Olympic Park station were not on a balloon loop and were a stub platform:
  • more tracks and platforms would be required.

  • arrivals into some platforms could block departures from other platforms.

  • time would be lost while drivers change ends and reset the train for the other direction.

  • if the driver changed ends and discovered a hidden fault, then delays to trains would be likely.



OTHER OLYMPIC STATIONS


  • The Olympic station at Berlin , Germany has two through platforms and about 8 turnback platforms. This is considerably more than the 2 track / 4 platform arrangement at Sydney.



SEE ALSO