What is the busiest railway bridge in the world.?

The railway bridge over the River Thames between Battersea Park Station and Victoria Station in London, England must surely be one of the busiest if not the busiest

TWO track is Portal Bridge

The Portal Bridge is a railroad bridge over the Hackensack River in northeastern New Jersey, USA, just west of Secaucus Junction. It is a two-track, moveable swing-span between the towns of Kearny and Secaucus owned and operated by Amtrak as part of the Northeast Corridor and also used by New Jersey Transit. As of 2015, it is considered the busiest train span in the Western Hemisphere, carrying between 150,000 and 200,000 passengers per day.

If you include structures over roads near a station or bridges used by Subway and city metro trains services there are many small short bridges over roads with a very large number of trains.

This station has a nearby portion over the road technically a bridge,

https://ca.video.search.yahoo.com/video/play;_ylt=...

Not sure about the count.

https://www.youtube.com/watch?v=3oHhqUIez8k

Busiest by Freight tonnage on a single track is the many on Burlington Northern in the States of Idaho and Washington. About 100 trains per day many over 100 cars long.

The Arna–Bergen stretch is one of Europe's busiest single track railway lines with 130 trains passing every day. Many bridges on that route.

Hohenzollern Bridge in Cologne, Germany, crossing the River Rhine.

6 tracks, more than 1200 trains per day

https://de.wikipedia.org/wiki/Datei:Hohenzollernbr...