Talk:Grand union

Additional union types, Examples

• I've added in details of 3/4, half, and butterfly unions, as they fit with the general scope of this article, without needing independent articles.
• I've done a significant cleanup of the Examples section for clarity and ease of reading, as well as adding Edmonton, Rochester, and Philadelphia examples with references and documentation.

--Hiroe (talk) 05:33, 29 August 2009 (UTC)

Frogs

The number of frogs one encounters is:

• 4, when going right
• 20, when going straight or left (on a right-running system)

18 is not correct. I've verified this by:

• counting the image
• if you go left or straight, you cross 4 other lines fully (4 frogs required) and diverge or converge with another track 4 times, which requires 1 frog each. 4*4 + 4*1 = 20
• if you go right, you only converge/diverge with four tracks, and cross zero tracks.

I have corrected this in the article. IIVQ (talk) 11:28, 13 January 2009 (UTC)

I believe this frog-counting is kinda meaningless, partly as the number of frogs will vary with the excact layout of the crossing. If for instance the radius of the right-turn curves are increased, that would eliminate two frogs. Also there may be several triple frogs where three rails cross close together, should they count as one or two? Do the designers of such crossings try to maximise the number of triple frogs to reduce the number of individual parts? — Preceding unsigned comment added by 80.202.145.57 (talk) 04:47, 19 May 2015 (UTC)

Number of tram lines

I put a citation needed on the number of tram lines needed to fully utilize a grand junction. It could use some explanation. Benandorsqueaks (talk) 05:09, 16 January 2009 (UTC)

External links modified

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Railfancruft

...complete with latitudes and longitudes, no less! EEng