I think the UK probably has the best railway data out of any country. Very few countries come close to having the level of data like Real Time Trains and Open Train Times and Traksy and similar sites provide. I would say the Netherlands is probably the second best after us.
As far as i am aware Finland and Hungary and Netherlands are the only other countries that provide unit numbers online. Unless anyone knows of any others. Maybe there are others these days.
A few sort of similar sites to RTT i could find are as follows:
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FINLAND:
Finland has this basic map showing the position of trains:
Seuraa junien kulkua ympäri Suomen reaaliajassa! Junat kartalla -palvelu hyödyntää junien GPS-paikannusta sekä Väyläviraston kulkutietoja, jotka antavat sinulle parhaan ja ajantasaisimman tiedon junien kulusta.
www.vr.fi
Finland also has this more detailed map which shows unit numbers:
Julia - Junaliikenteen havaintojärjestelmä
juliadata.fi
You have to click on the train and then scroll to the bottom of the page to see the unit number.
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HUNGARY:
Hungary has this app which shows the unit numbers of all trains:
Vonatinfó – official journey planner for train travels within Hungary.
play.google.com
After selecting a train you scroll to the technical information tab and it gives the unit number.
I am not sure if there is a website too. All i can find is that app. But i presume if the app shows it then there must be a website too. If anyone knows of a website too that would be great.
There is also a similar app available for buses and trolleybuses and trams in Budapest too:
BKK's offical integrated journey planning and ticketing application
play.google.com
It tells you the bus or trolleybus or tram fleet number or reg number when you click on the vehicle.
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A lot of countries also have basic maps showing the position of trains:
Czech Republic:
mapy.spravazeleznic.cz
Slovakia:
Slovenia:
But these do lack the level of details that the timetable data on RTT offers.
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I would be particularly interested if anyone knows of any sites for Ireland and Northern Ireland and New Zealand as i have never been able to find any sites like RTT for these. Such information seems to be severely lacking in these places.