00 vs Ho?

Discussion in 'HO Scale Model Trains' started by MarioBarb, Nov 21, 2005.

  1. MarioBarb

    MarioBarb New Member


    Bit new to the whole train scene here, but while browsing ebay for rolling stock I noticed someone differentaite between HO scale and OO.

    Any serious difference here.

    Also - how do the experts on this forum rate Hornby and Lima?


  2. wjstix

    wjstix Member

    Long story short - HO scale/guage was first created many years ago in Germany by Marklin, with a scale of 3.5mm = 1 foot or 1:87. This scale caught on quite well on the continent and in the USA, but in Britain, they were unable to fit a motor into a UK locomotive built to that scale, so they kept the same track guage as HO (16.5mm) but increased the scale size to 4mm = 1 foot, or 1:72. So...both OO and HO use the same track guage, but OO engines, cars, buildings, people, etc. are slightly bigger than their HO counterparts.
  3. CommodoreVander

    CommodoreVander New Member

    HO is 1/87 scale (3.5mm=1 foot) equipment that runs on HO gauge (16.5mm) track.
    OO is 1/76 scale (4mm=1 foot) equipment - usually British outline - taht also runs on HO gauge (16.5mm) track. OO also can refer to - mostly in the US - 4mm=1 foot equipment that runs on the proper gauge (I think 18mm, don't remember off hand) track, but very few if any people model in this gauge/scale combination anymore.

    The reason OO uses HO track in Britain has to do with the size of early motors and the fact that British outline equipment is a bit smaller than US or European equipment. because of this, somebody decided to create models in a larger scale for the British (the same thing was done with British N scale in the 1960's too).

    So basically, OO runs on HO, but is a larger scale...
  4. hminky

    hminky Member

    Most "old time", 1870's, equipment made in the US is OO/HO. Here is the IHC 4-4-0 with the correct OO scale figures. The 4-4-0 is an OO scale (1/76) model running on HO track. I model the 1870's in OO/HO at:

    Thank you if you visit

  5. 60103

    60103 Pooh Bah

    American OO is 19mm gauge. Lionel made a bunch of it just before WWII, but not after and it's a rare collectible now. There were other manufacturers doing kits, some of which Lionel plagiarized for their line.
    Nowadays, OO is confined to British modelling. There is a tinge of HO scale modelling in Britain, but not much. Effectively all the commercial scenic part is OO (4mm to 1 foot or 1:76) and the track is mostly 16.5 BUT there are groups working in 18.2 mm and 18.83 mm gauge.
    Recent commercial OO models run quite well on standard HO track; older ones do not.
    OO modelling of North American trains is rarer than HO modelling of British trains.
    The scale ratio is 8:7, bur the British OO trains are about the bulk of American HO trains.

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