Dual gauge Locomotives & rolling stock

 
  sx69181 Station Staff

Location: QUEENSLAND
I was wondering if it is possible to run 7 1/4'' gauge equipment to run on 7 1/2'' gauge track

Thank you

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  dthead Site Admin

Location: Melbourne, Australia
AndrewMierisch took Y121 to the USA in 2012.  so did two other friends with their loco, a 49 and a XPT. In all casees they changed the wheels and brakes. Y121 gor it's temnporary wheels the night before we took it to be shipped........

TO run on both with little modification  would be a engiuneering challange for that 1/4 of a inch.  To run witout modification would be almost inmpossible  as one would wear out points.....

Still wonder what others may say.


Regards,
David Head
  TomBTR Train Controller

Location: near Sydney
In general the answer in no, the back-to-back measurement is too small for standard US 7.5" points. However there are some tracks (mainly east coast or Canada) that have been deliberately made to work both gauges. They are 7.5" gauge but the points are made with standard check rail separation from the running rail and wide flangeways in the frog. At least one track (Cinder Sniffers) uses a point design without check rails and boasts dual gauge operation.

Unfortunately track gauge tolerance and wear mean that the gauge as measured can be more than 7.5" and fine scale 7.25" can drop. What they call "narrow gauge", that is wide wheels work well. (AALS wheels can be up to 1" wide which should work)

Most tracks in the south and west of the USA are designed for 7.5" gauge only, so unless you have a specific track in mind better change your wheels.

Another issue is flange depth. IBLS flanges are shallower than AALS due to their use of cast aluminium frogs. They specify a maximum depth to avoid damage. In reverse, IBLS flanges sometimes cause trouble on Australian tracks due to not tripping flange detecting signals and not always trailing through points properly.
  sx69181 Station Staff

Location: QUEENSLAND
Thanks very much I was just wondering if it was possible to do.
  sx69181 Station Staff

Location: QUEENSLAND
Thanks very much I was just wondering if it was possible to do.

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